Fix Proton.initialize
Add AbstractModule and fix race condition in Proton.getInstance
Rename SaveState to RetainState
Add getting started on README.md
Merge pull request #1 from takiguchi0817/add_getting_started_on_readme

Add sections on README.md
Improve binding builder
Fix crash issue at API level8
Remove unused import
Fix crash issue at API level7
Set minSdkVersion to 7

 - Added target api annotation for LINT
Merge pull request #2 from jfsso/master

Set minSdkVersion to 7
Added travis.yml

 - modified targets
 - added script to wait for emulator
Merge pull request #3 from jfsso/travis-ci

Added travis.yml
Add travis status to README.md