Add Constraint2D classes.
Add Urho2DPhysicsRope sample.[ci skip]
Add Constraint2D Lua and AngelScript binding. [ci skip]
Add Urho2DPhysicsRope Lua and AngelScript sample. [ci skip]
Missing editor icons for 2D components.[ci skip]
Added note that tangents are needed for normal mapping. Clean up SoundSource decoder handling to prepare for application-supplied sound stream.
Travis CI: API documentation update at 2014-03-18 13:40:46 UTC.
[ci package]
Fix interpolation of the decoder buffer when it loops.
Removed SDL hack to get window handle for Direct3D9. Instead use SDL builtin functionality.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Bin/Data/LuaScripts/27_Urho2DPhysics.lua
	Docs/AngelScriptAPI.h
	Docs/ScriptAPI.dox
	Source/Engine/LuaScript/pkgs/Urho2DLuaAPI.pkg
	Source/Samples/CMakeLists.txt