Adds v0.4.0 code

.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+node_modules/
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+build/
+lib/
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

.npmignore

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+# Original source code
+src/

LICENSE

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+Copyright 2020 Narrative Science
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

README.md

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+Log.io - Real-time log monitoring in your browser
+=================================================
+
+Powered by [node.js](http://nodejs.org) + [socket.io](http://socket.io)
+
+## How does it work?
+
+A **file input** watches log files for changes, sends new messages to the **server** via TCP, which broadcasts to **browsers** via socket.io.
+
+Users can watch adhoc log streams by activating inputs and binding them to multiple screens via the web UI.
+
+## Terminology
+
+**Stream** - A logical designation for a group of messages that relate to one another.  Examples include an application name, a topic name, or a backend service name.
+
+**Source** - A physical designation for a group of messages that originate from the same source.  Examples include a server name, a service provider name, or a filename.
+
+**Input** - A (stream, source) pair.
+
+While originally designed to represent backend service logs spread across multiple servers, the stream/source abstraction is intentionally open-ended to allow users to define a system topology for their specific use case.
+
+## Install & run server
+
+1) Install via npm
+
+```
+npm install log.io
+```
+
+2) Configure hosts & ports (see example below)
+
+```
+nano ~/.log.io/server.json
+```
+
+3) Run server
+
+```
+log.io-server
+```
+
+3) Browse to http://localhost:6688
+
+## Install & run file input
+
+1) Install via npm
+
+```
+npm install log.io-file-input
+```
+
+2) Configure file input (see example below)
+
+```
+nano ~/.log.io/inputs/file.json
+```
+
+3) Run file input
+
+```
+log.io-file-input
+```
+
+## Server configuration
+
+There are two servers: the message server, which receives TCP messages from message inputs, and the HTTP server, which receives requests from browsers.  By default, the application looks for configuration in `~/.log.io/server.json`, and can be overridden with the environment variable `LOGIO_SERVER_CONFIG_PATH`.
+
+Sample configuration file:
+
+```json
+{
+  "messageServer": {
+    "port": 6689,
+    "host": "127.0.0.1"
+  },
+  "httpServer": {
+    "port": 6688,
+    "host": "127.0.0.1"
+  },
+  "debug": false
+}
+
+```
+
+## File input configuration
+
+Inputs are created by associating file paths with stream and source names in a configuration file.  By default, the file input looks for configuration in `~/.log.io/inputs/file.json`, and can be overridden with the environment variable `LOGIO_FILE_INPUT_CONFIG_PATH`.
+
+Sample configuration file:
+
+```json
+{
+  "messageServer": {
+    "host": "127.0.0.1",
+    "port": 6689
+  },
+  "inputs": [
+    {
+      "source": "server1",
+      "stream": "app1",
+      "config": {
+        "path": "log.io-demo/file-generator/app1-server1.log"
+      }
+    },
+    {
+      "source": "server2",
+      "stream": "app1",
+      "config": {
+        "path": "log.io-demo/file-generator/app1-server2.log"
+      }
+    },
+    {
+      "source": "server1",
+      "stream": "app2",
+      "config": {
+        "path": "log.io-demo/file-generator/app2-server1.log"
+      }
+    },
+    {
+      "source": "server2",
+      "stream": "app2",
+      "config": {
+        "path": "log.io-demo/file-generator/app2-server2.log"
+      }
+    }
+  ]
+}
+
+```
+
+
+## Server TCP interface
+
+The file input connects to the server via TCP, and writes properly formatted strings to the socket.  Custom inputs can send messages to the server using the following commands, each of which ends with a null character:
+
+Send a log message
+
+```
++msg|streamName1|sourceName1|this is log message\0
+```
+
+Register a new input
+
+```
++input|streamName1|sourceName1\0
+```
+
+Remove an existing input
+
+```
+-input|streamName1|sourceName1\0
+```

inputs/file/.eslintrc

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+{
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint"],
+  "extends": ["airbnb-base", "plugin:@typescript-eslint/recommended"],
+  "rules": {
+    "import/no-unresolved": "off",
+    "semi": "off",
+    "@typescript-eslint/member-delimiter-style": "off"
+  }
+}

inputs/file/babel.config.js

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+module.exports = {
+  presets: [
+    "@babel/preset-env",
+    "@babel/typescript"
+  ],
+  plugins: [
+    "@babel/proposal-class-properties",
+    "@babel/proposal-object-rest-spread",
+    "@babel/transform-runtime",
+  ]
+}

inputs/file/bin/log.io-file-input

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+#!/usr/bin/env node
+require("../lib/index.js")

inputs/file/config.json

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+{
+  "messageServer": {
+    "host": "127.0.0.1",
+    "port": 6689
+  },
+  "inputs": [
+    {
+      "source": "server1",
+      "stream": "app1",
+      "config": {
+        "path": "log.io-demo/file-generator/app1-server1.log"
+      }
+    },
+    {
+      "source": "server2",
+      "stream": "app1",
+      "config": {
+        "path": "log.io-demo/file-generator/app1-server2.log"
+      }
+    },
+    {
+      "source": "server1",
+      "stream": "app2",
+      "config": {
+        "path": "log.io-demo/file-generator/app2-server1.log"
+      }
+    },
+    {
+      "source": "server2",
+      "stream": "app2",
+      "config": {
+        "path": "log.io-demo/file-generator/app2-server2.log"
+      }
+    }
+  ]
+}