Add tile map support in Urho2D, current not all of features are supported in Urho2D, but I think we can add it later. Fore more information about tile map, please refer http://www.mapeditor.org/.
Change tile size to float, fix bug, change Desert.png.
Add image layer support.
Add object group.
Add properties.
Add tile properties.
Add visible property to layer.
Move some functions from header file to source file. For all of objects create node for it.
Refactor tile map.
refactor tile map code.
Fix index out of range
Added function to list json object member value names
Switch to long document output names
Merge pull request #422 from friesencr/short-names-no

Switch to long document output names.
Replace old link references.
[ci skip]
Fix line wrap in the Readme.txt when viewed from GitHub.
[ci skip]
Change Properties2D derived from RefCounted.
Remove some functions.[ci skip]
For Travis CI - fix the commit message for API documentation update.
Move tile object define to TileMapDefs2D. Add half pixel offset in Direct3D mode.