ios es2 cleanup

- fixes shader errors in issue #2233 with the use of ofGLReadyCallback()
- added enableRendererES20() and enableRendererES11() methods to
ofAppiPhoneWindow
- updated code that references ofGLProgrammableRenderer, mainly now
using ofIsGLProgrammableRenderer() which was recently introduced.
- cleaned up ofAppiPhoneWindow (formatting + removed old code)
Merge branch 'develop' of https://github.com/openframeworks/openFrameworks into ios-es2-cleanup
added ofReloadGLResources()
renamed ES11 to ES1 and ES20 to ES2 - for simplicity
Merge pull request #2248 from julapy/ios-es2-cleanup

ok good to merge.
Revert "really fix confusing ofRectangle ostream output"

This reverts commit 3fd61aacd4cee4f7eb65e08b1fab23973537b3db.
Revert "fix confusing ofRectangle ostream output"

This reverts commit 507b65e1a5b63515829f2cf08da4224a4ed937d9.
ofGstVideoGraber: ifdex listdevices for gst 1.0 only some used functions
don't exist in 0.10
Merge branch 'develop' of https://github.com/openframeworks/openFrameworks.git into develop