Merge pull request #136 from CyberAgent/develop

Develop
Merge pull request #137 from CyberAgent/develop

Adjustment to Jni, and Bug fix
Merge pull request #139 from CyberAgent/develop

Updated Travis Settings
Merge pull request #142 from CyberAgent/develop

1.2.2-SNAPSHOT released
added GPUImageLevelsFilter
small sample for Levels Filter
Merge pull request #119 from vashisthg/develop

added GPUImageLevelsFilter