Rcommit these filters, Please ignore pre

Rcommit these filters, Please ignore the previous pull request
Merge branch 'develop' of git://github.com/dotyso/android-gpuimage into merge
GPUImageExposureFilter, GPUImageHighlightShadowFilter, GPUImageMonochromeFilter, GPUImageOpacityFilter, GPUImageRGBFilter, GPUImageSaturationFilter, GPUImageVignetteFilter, GPUImageWhiteBalanceFilter
Use onInitialized instead of old way. Replace tabs with spaces.