Build all java files into jar for each module on Android

BUG=
R=fischman@webrtc.org, niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1636004

Patch from Jeremy Mao <yujie.mao@intel.com>.

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4211 4adac7df-926f-26a2-2b94-8c16560cd09d
11 files changed