Travis:

Use install-deps.sh
Run make test
Notify in #desura, if build status changes from broken to ok, or from ok to broken.
Travis: remove redundant tests.
partially revert "Travis:"

the update of all needed package can fail unter some circumstances.
See here: https://travis-ci.org/karolherbst/Desurium/builds/4325989

We should install only the missing ones
test: use BOOST_REQUIRE_EQUALS instead ==
test: remove getAppPath test in UtilLinux_test

this function will be tested by "GUI" Test cases as well.

If it's working desurium will start correctly, if not then not.
It doesn't make sense to test this function the same way it was implemented.
test: tidy up UtilLinux_test

this should eliminate test failures throw std::cout (for example if some xdg aren't installed)