Commit für pull
Merge branch 'master' of https://github.com/koradir/dmdb2014
Merge branch 'master' of https://github.com/koradir/dmdb2014

Conflicts:
	src/ch/ethz/inf/dbproject/model/DatastoreInterface.java
Commit for pull.
Merge branch 'master' of https://github.com/koradir/dmdb2014
Merge branch 'master' of https://github.com/koradir/dmdb2014
Merge branch 'master' of https://github.com/koradir/dmdb2014
Max and GroupBy Testcases are now independent of our database.
Some more GroupBy-Testcases
Merge branch 'master' of https://github.com/koradir/dmdb2014
Added two testcases for the Helper-Operator.
One more test for Like.
Removed a bug in GroupBy discovered when adding tests for like and distinct.
Added a test for group by on multiple columns.