Travis CI: site documentation update at 2014-09-29 10:40:43 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/e06762db76ec1d60ac38d84d351f7535985d6166

Message: On non-MSVC compiler, default to 64-bit when host compiler is.
The default can be overriden using URHO3D_64BIT build option as before.