For Travis CI - automate housekeeping of old snapshots.
[ci package]
Travis CI: API documentation update at 2014-03-12 02:39:20 UTC.
[ci skip]
For Travis CI - setup digital key earlier for housekeeping to work.
[ci package]
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Docs/LuaScriptAPI.dox