cleaned up UnionScan, added tests and adjusted namespace in perf_regression/UnionScan.cpp
Merge pull request #69 from timbokopter/feature/cleanup_UnionScan

cleaned up UnionScan and added tests
Merge branch 'master' of git://github.com/hyrise/hyrise
added PlanOperation that spawns subtasks (for testing purposes)
cleaned up access/MultiplyRefField
cleaned up access/Histogram
Merge pull request #78 from timbokopter/feature/cleanup_Histogram

cleaned up access/Histogram
Merge pull request #76 from timbokopter/feature/cleanup_MultiplyRefField

cleaned up access/MultiplyRefField
Updating .gitignore
Land backward-cpp integration, fixes #34, #79
Add backward cpp submodule
Add ability to actually disable backward-cpp integration
merged with master
fix index scan bug
Merge branch 'master' of git://github.com/hyrise/hyrise
plan ops for consequtive and parallel spawning
spawned task now random sleep time
removed output