implement setSpeed in ofxiOSVideoPlayer
add changelog note for ios video setSpeed()
assimp: fix to allow to put loaders on vectors and in general fix copy
assimp: use shared_ptr for scene
ofParameterGroup: fix nested parameter groups and memory leak, switch ofPtr to shared_ptr.
Closes #2674
ofThread: detach thread on stop if it's not being waited. Closes #2506
ofThread, change order of flags and detach to avoid potential problems
refactor window should close commit to avoid dependencies from ofEvents to GLFW
ofParameter(Group) fix polymorphism on parameter groups
added left alt key detection to events example
added CoreVideo for new glfw lib
bugfix for ofxiOSImagePicker crash on exit. code cleanup. switch to using ofPixels. ofxiOSImagePicker example updated. closes #1730
add keycode, scancode and codepoint to ofKeyEventArgs
Merge branch 'master' of github.com:openframeworks/openFrameworks
added function ofxiOSImagePicker::clear to clear the internal ofPixels buffer.
Merge branch 'master' of https://github.com/openframeworks/openFrameworks
Merge pull request #2961 from admsyn/fix-ios-implement-video-setspeed

Implement setSpeed in ofxiOSVideoPlayer
CHANGELOG: glfw and key events changes
Merge branch 'master' of github.com:openframeworks/openFrameworks
ofXml: fix crash on empty document