#32: Header added to CodeOptimization.hs
#32: Header added
Bugfix: Preprocessor now returns an error iff there is no line starting with a dollar sign
Integration tests: io-files added and updated folders
Removed test cases from preprocessor until I come up with an idea how to do negative testing in HUnit when the expected behavior is throwing an error
Merge branch 'master' of https://github.com/SWP-Ubau-SoSe2014-Haskell/SWPSoSe14