CI for sled

[fridtjof]

This PR introduces Travis CI automated building and testing of basic functionality, plus running with ASan and UBSan, closing #12.

• [x] Building sled.
• [x] Running sled with a debug output.
• [x] Drawing as fast as possible.
• [x] Exiting after 10 iterations through every module.
• [x] Reports warnings and possible code errors.