Implemented Checkstyle for jenkins and updated files based on checkstyle feedback

Checkstyle is built for jenkins, and a lot of files have been changed to comply with its feedback. The default rules of checkstyle have been modified to better fit our project. 
Once this is integrated into the main repo, then we can configure jenkins to do the checkstyle automatically. That process should take 5 minutes, but doing it ealier will break all successive builds.

Added Files:
realtalk_styles.xml (this is re-added actually)
libs/checkstyle-5.6-all.jar

Modified Files:
build.xml
*Activity.java
ChatManager.java
ChatController.java
ChatRoomResultSet.java
CommonUtilities.java
JSONParser.java
MessageInfo.java
PullMessageResultSet.java
RequestParameters.java
RequestResultSet.java
ResponseParameters.java
GCMUtilities.java