Update Podspec to 0.1.6

The 0.1.6 release didn't update the podspec, so updates for Cocoapods users weren't working. Thanks for the great project!
Merge pull request #1773 from bcherry/patch-1

Update Podspec to 0.1.6
Merge branch 'master' of https://github.com/BradLarson/GPUImage
fix build script & remove old method from GPUImageRawDataOutput