Removed all builds. Only indent test.
Moved download and install of astyle into before_install section. Renamed files.
Merge pull request #118 from luca-heltai/fix_travis_ci

Removed all builds. Only indent test.

I implemented here Matthias' suggestion. Removing all unnecessary comments and lines from the Travis CI configuration scripts. This should also make it much faster, since we don't need to install anything anymore (except astyle). This is the one that closes #89.