Only build tests if instructed and check is present
Enable tests by default
Cleanup travis script and have valgrind only output leaks
Re-enable dependency installation
Don't echo make commands
Conditionally remove build folder on clean
Add coveralls support: try #1
Fix broken if statement in travis.sh
Install cpp-coveralls
Add excludes to coveralls call
Add coveralls badge
Change coveralls excludes again
Change coveralls excludes again
Merge build system changes, including coveralls.io support