fix typo
a bit more work on transitions view
transition timing is now per-key, not also per-layer. Added timing.enabled
a bit more transition view work
s/flatten lib directory and rename as mg
added command to maximize canvas view; change key shortcuts
draw timing blocks in transition view
removed support for reversible transitions
refactor MgCoreAnimationLayer -> MgViewContext, abstracts layer classes
map MgGroupLayer to MgGroupCALayer; misc other layer-hosting progress
added Mg{Gradient,Image,Path,Rect}CALayer layer-hosting classes
move mg text files
optimize mg->ca sublayers update for no changes