Update filters that use GPUImageGaussianBlurFilter
Use GPUImage's head in Demo app
Bump version, require require iOS 5 (GPUImage's head)
NBUCameraViewController: Fix circular retain
Fix Travis
NBUAssetsGroup: Call result block even when no assets are present
NBUAssetsGroupViewController: Refactor assets loading

Fixes #11.
Bump version
Merge branch 'refs/heads/development'