this project is about android messenger app
haha
Merge branch 'MAPP_HEAD'
Updated .gitignore
Tell git to ignore the following directories:
	* /gen/
	* /bin/
	* /libs/
Updated TcpSender.java.
Match specification for API 8.
Updated TcpReceiverWorker.java.
Match specification for API 8.
Updated MainActivity.java.
Added codes to use TcpSender and TcpReceiver in MainActivity.java.