Documentation for Asset class

Added documentation for openfl.Assets
Tilemap Documentation
Merge pull request #361 from kidveno/master

A little documentation
Fix typedef for Matrix3D/Orientation3D
Fix Flash Matrix3D to use openfl.Vector instead of flash.Vector
Test fix
Initial support for library preloading (requires matching Lime tools)
Add <library /> preload support to v2 template
added TILE_RECT flag to Tilesheet
added TILE_ORIGIN flag
fix for flash
one more fix
my bad, again
updates for canvas graphics
Merge pull request #362 from Beeblerox/TILE_RECT

added TILE_RECT flag to Tilesheet
Add dummy haxelib.xml
Help hide __ASSET__ classes from dev FlashDevelop builds
Update to 2.1.2
Update CI script
Merge branch 'master' into dev