Move DebugHud update to PostUpdate event so that values set during Update will be displayed on the same frame. Additionally, exposed DebugHud::Update() to script to allow calling it manually and forcing update of values, if necessary. Closes #466.
Travis CI: API documentation update at 2014-09-23 07:25:16 UTC.
[ci package]
For Travis CI - switch CI build to use Raspberry-Pi build environment.