Isometric got some love <3

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2014-09-17 : v0.7.6
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* Added: Map:convertToIsometric and Map:convertFromIsometric
* Added: Map:setObjectCoordinates
* Added: Map:rotateVertex
* Fixed: Adjusted map positioning for Isometric and Staggered maps
* Fixed: Object positioning in Isometric maps
* Removed: Temporary fix for Tiled 0.9.1