introduce automatic generation of registry endpoints

- uses plugins.yaml at the root to generate:
    1. registry/plugins json file containing main info on all plugins
    2. registry/plugin/PLUGIN_ID/versions json file containing versions of the corresponding
    plugin which id is PLUGIN_ID. One file per plugin found in the initial yaml file
- delegates to travis-ci the generation of the json files.

fixes #14

Author: McFoggy

.travis.yml

@@ -0,0 +1,15 @@
+language: node_js
+install: npm install
+before_script:
+- git config --global user.email "[email protected]"
+- git config --global user.name "GitbucketPlugins CI Agent"
+script: node index.js
+after_success:
+- git config credential.helper "store --file=.git/credentials"
+- echo "https://${GH_TOKEN}:@github.com" > .git/credentials
+- git add .
+- git commit -m "updating generated plugins data"
+- git push origin master
+env:
+  global:
+    secure: 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

index.js

@@ -0,0 +1,60 @@
+'use strict';
+
+global.__basedir = __dirname;
+
+var yaml = require('node-yaml')
+    , fs = require('fs')
+    , mkdirp = require('mkdirp')
+    , path  = require('path');
+
+
+// Let's read the plugins.yaml data file and use it to generate our required data
+yaml.read ('plugins.yaml', {}, function (err, data) {
+    var nbPlugins = data.length;
+    console.log('generating ' + nbPlugins + ' plugins definitions');
+
+    generateMainPluginsJSONData(data);
+
+    for (var i = 0; i < nbPlugins; i++) {
+        generateIndividualPluginJSONData(data[i])
+    }
+    console.log('done.');
+});
+
+
+function generateIndividualPluginJSONData(plugin) {
+    var pluginPath = path.join(__basedir, 'registry', 'plugin', plugin.id);
+    mkdirSync(pluginPath);
+    fs.writeFile(path.join(pluginPath, 'versions'), JSON.stringify(plugin.versions, null, 2), {flag:'w'}, function(err) {
+        if (err) throw err;
+    });
+}
+
+function generateMainPluginsJSONData(data) {
+    var copy = JSON.parse(JSON.stringify(data));
+    for (var plugin in copy) {
+        delete plugin.versions;
+    }
+    var registryPath = path.join(__basedir, 'registry');
+    mkdirSync(registryPath);
+    fs.writeFile(path.join(registryPath, 'plugins'), JSON.stringify(copy, null, 2), {flag:'w'}, function(err) {
+        if (err) throw err;
+    });
+}
+
+/**
+ * Simple wrapper that allows to handle already existing path
+ * @param path the path to directory to create
+ */
+var mkdirSync = function (path) {
+    try {
+        mkdirp.sync(path);
+        // mkdirp(path, function(err) {
+        //     if (__debug) console.log('could not create ' + path + ' due to ' + err);
+        // });
+    } catch(e) {
+        if ( e.code != 'EEXIST' ) {
+            throw e;
+        }
+    }
+};