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
fixes #1775 where it can't run in iOS simulator

This samples can't be invalidated in this case.
fixes issue #1783
fixes issue #1783
correction of the fix #1783
Merge branch 'fix_for_1783'

Conflicts:
	framework/Source/iOS/GPUImageMovieWriter.m