Travis CI valgrind tests

[cxong]

Travis CI integration was recently implemented; it's very neat as it is able to catch compile errors and run a few unit tests.

Most of C-Dogs SDL isn't covered by unit tests unfortunately, and it would be great to have Travis run it under valgrind to prevent memory leaks etc. from creeping in.

• Start with running the existing unit tests under valgrind (is this going to severely affect build times?)
• May need a few commandline args to run for Travis specifically:
  • No sound, as Travis may have trouble with sound devices
  • Exit after game as loaded (unless Travis can send keystrokes? Ctrl-C?)

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[carstene1ns]

export SDL_AUDIODRIVER=dummy will disable all audio output, same goes for SDL_VIDEODRIVER.

But some kind of time bomb is needed, because cdogs does not close then (needs SIGKILL).

[carstene1ns]

Okay, issue is already known. #245

[carstene1ns]

Another possibility would be to introduce a demo mode, that loads a random map and lets some AI deathmatch start (like on arcade machines). This mode can be triggered with --demo and run endlessly or with a timer. The timer mode can be abused for travis-ci then.

[cxong]

We can start by running the tests under valgrind. Instructions available here: http://stackoverflow.com/a/9843594/2038264