Integrating munit to Travis. Only in test for now.

Correctly non working, but since travis decided not to update anymore on my repository, I don't have any other solution but to work on the main one.

What was done :
Corrected installation of hxcpp and munit in travis.
Fixing some issues with gcc on ubuntu for travis.
Trying to run munit test on chrome for easier handling of errors.
Installing chrome in a specific sandbox mode.
Correcting command to execute travis-setup.sh