Merge pull request #197 from bastih/master

Partial revert, add server tests for CI
Merge pull request #202 from bastih/master

Some small cleanups
Adding missing test and docs
Merge pull request #204 from hyrise/feature/groupby_doc_test_fix

Adding tests and docs
Fix tpcc mini tables+header+testcase
Merge pull request #209 from kateyy/feature/TPCCTableFix

Fix tpcc mini tables+header+testcase