Merge pull request #5 from swcai/da18ff5af43b5d890945cd257152c03952cbadad

Add GPUImageColorInvertFilter implementation
Merge pull request #6 from swcai/develop

x86 support, GPUImageHueFilter, GPUImagePixelationFilter
Fix compilation errors
Insert license headers
Updated pom.xml to newer android-maven version
Added x86 native file
Merge pull request #1 from cyberagent-jp/develop

Develop