Fixing issue with MatrixAffine2::rotateCopy methods

Before that, the following would not compile due to:
No matching member function for call to 'rotateCopy'

ci::MatrixAffine2f m1;
auto m2 = m1.rotateCopy(M_PI * 0.5f);
auto m3 = m1.rotateCopy(M_PI * 0.5f, ci::Vec2f(100, 200));
Merge pull request #406 from arielm/fix/MatrixAffine2

Fixing issue with MatrixAffine2::rotateCopy methods
JsonTree additions: getNumChildren(), getNodeType(), getValueForKey(), getValueAtIndex(), addChild().
BanTheRewind's test updates
TUIOListener sample update
TUIOMMultiTouchBasic sample update
Inverted logic on VboMesh::VertexIter::isDone()
Fixing Display::getContentScale()
Merge pull request #417 from arielm/fix-retina-osx

Fixing Display::getContentScale()
Addressing leak in qtime::MovieWriter
Merge branch 'dev' of github.com:cinder/Cinder into dev