Fix a texture problem when loading PVR image

Fix a bug which causes current texture changed when loading a PVR image with GLStateCache enabled.
Clear bad smell code of android fps control.
fixed CCArmatureAnimation::setSpeedScale
Merge pull request #7809 from 2youyouo2/v2

fixed CCArmatureAnimation::setSpeedScale
Merge pull request #7803 from ggggamer/v2

Clear bad smell code of android fps control.
remove cascade color for ColorFrame
Merge pull request #7826 from 2youyouo2/v2

remove cascade color for ColorFrame
Merge pull request #7164 from billtt/v2_fixPVRLoad

Fix a texture problem when loading PVR image
Merge branch 'v2' of https://github.com/cocos2d/cocos2d-x into v2