Added TmxVec4 and changed loadMask

Made loadMask return a vector 4 (TmxVec4) of the coords of the grid
tiles it marked "true", along with the width and height of the tiles.
This allows external physics engine usage as well as manual entity
placement.
Use the spacing of tileset
Merge pull request #13 from theRemix/master

fixed TmxEntity.loadGraphic() for !flash targets and .tmx data node missing 'encoding'
Readme typo, Fix #14
Merge branch 'master' of https://github.com/elnabo/tiled into elnabo-master
Basic support for image layers
Using abstracts instead of Dynamic
Add support for Haxepunk's new SlopedGrid mask

Adds loadSlopedMask() for creating a SlopedGrid using tmx tile
properties
Merge pull request #9 from ShaneK/master

Added TmxVec4 and changed loadMask
Merge pull request #24 from squiddingme/master

Add support for Haxepunk's new SlopedGrid mask
Adding 'has' function to TmxPropertySet to check whether a property exists.
Merge pull request #25 from bendmorris/master

Adding 'has' function to TmxPropertySet to check whether a property exists