NETCONF RFC6241 and RFC6242 conformance fixes (#22)

* - NETCONF RFC6241 and RFC6242 conformance fixes
  . xml version conformance
  . hello message conformance
  . rpc message conformance
  . framing protocol conformance
- Extracting reused strings to constants
- updated gitignore

* - used single imports
- fixed broken idents caused by auto-formatting

* increased version to 2.0.1

Author: jonasglass

.gitignore

@@ -9,3 +9,12 @@ target
 .settings
 .project
 .classpath
+
+# IntelliJ #
+*.iml
+.idea/
+.gradle/
+gradle/
+libraries/
+gradlew
+gradlew.bat

pom.xml

@@ -7,7 +7,7 @@
 
     <groupId>net.juniper.netconf</groupId>
     <artifactId>netconf-java</artifactId>
-    <version>2.0.0</version>
+    <version>2.0.1</version>
     <packaging>jar</packaging>
 
     <properties>