Implemented logger level configuration, added Javadoc

Fixes #45

src/main/java/envoy/client/ui/Startup.java

@@ -60,6 +60,7 @@ public class Startup {
 			e.printStackTrace();
 		}
 		
+		// Set new logger levels loaded from config
 		EnvoyLog.setFileLevelBarrier(config.getFileLevelBarrier());
 		EnvoyLog.setConsoleLevelBarrier(config.getConsoleLevelBarrier());