Removed ancestors and made GpuPacker a single class
Changed name to EglRgba
Removed old EGLImage class (renamed)
Added parameters to creation of egl image
Adapted to changed GpuPacker
Added packer for packing a downscaled image
Fixed error
Removed hardcoded parameters
Merge pull request #4 from EmilWestergren/master

Added functionality for downscaling texture