Rename FlxPhys classes to FlxNape
First part:
* Fixed the files when the tmx file is encoded in base64 but not compressed.
* Added a TiledTile class to support flip and rotation (just for tmx encoded in base64)
Part two:
* Fixed a little problem dealing with the rotation solving
* Added a generic class FlxTileSpecial for saving the special data of a tile (flip/rotation)
* Modified the FlxTilemapExt class to add the logic to deal with the flipped/rotated tiles and how to draw them
Part two (continued):
* Reverting a fix that didn't fix anything
* Added a function to resolve the tiles gid from a csv string, it doesn't work :/
Part two (yes, again):
* Moved the creation of the flipped BitmapData to the FlxTileSpecial class so it will only create the flipped tile once.
* Fixed a bug I made in the last commit
Part three (yay!):
* Added animated tiles in FlxTileSpecial
* FlxTilemapExt will draw them. Not yet in flash :(
Part three (yep...):
* Added animated tiles for flash!!! But it won't work because FlxTilemap set the buffer not dirty after drawTilemap is called :__
Part three (yep v2):
* Animation in flash works now... I didn't want to copy the whole function just to swap 2 lines but... I did
Part three (oh, not again...):
* Made some changes in TiledTileSet:
  - Made the var tileProps public to be able to access it
  - Added the var properties with the tileset properties
Part four:
* Added alpha to the tilemap.
* Fixed the opacity of the TiledLayer
* Seems to fix the tile tearing problem when is not compiled in flash. It needs more tests
* Inlining and renaming a few variables/methods
* Removing all the special tiles that aren't special.
* Only update tiles that have an animation.