Fix incorrect parameter in documentation

This was causing LDocGen to fail
Travis: build and upload LDocGen generated docs

They will be built for every commit, but only uploaded for master.
If the documentation doesn't correctly match the object it is
describing, then this will return an error and the build will be
marked as failed.
Update ffmpeg in Travis
Pauses game when messages opened

Will pause game when any messages are opened and return to previous
speed once closed

As per suggestion seen on google code earlier
Merge pull request #222 from mrtnptrs/ffmpeg-2.1.4

Update ffmpeg in Travis
Merge pull request #224 from MarkL1961/Pauses-on-open-msg

Pauses game when messages opened
Merge pull request #207 from alanwoolley/ldocgen

Make LDocGen work again!
Update LDocGen links to point to GitHub
Merge pull request #226 from alanwoolley/LDocGen-GH

Update LDocGen links to point to GitHub