Travis CI: site documentation update at 2014-03-30 17:44:18 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/1418fb7e830905e1a0ace3d3036c560fdba569f9

Message: Changed the SM2.0 tradeoffs to allow 4-sample shadow mapping and to verify that shaders again work on GPU's without hardware shadow compare (eg. Radeon 9800.) Removed unnecessary shader code & simplified the LitSolid & light volume shaders.