fix for possibly invalid core calculation
Performance and other improvements:
- Index based joins
- Renaming of columns in PC
- Performance Improvements
Merge pull request #271 from hyrise/feature/thrift

Index Based Operations
Introduce lazy sessions

Session contexts are only created when requests actually change data,
instead of creating contexts whenever a session starts.
Cleanup usage of boost optional
Merge pull request #277 from bastih/feature/lazy_sessions

lazy sessions
Silence warning in dictionary tests
Remove unused stdlib.hpp
Enable building in subfolders
Merge pull request #288 from bastih/master

Enable building in subfolders
Bugfixes / Improvements to DynamicPriorityScheduler

* RadixJoin no longer caps the probe phase to 24 instances.
* A new fitting model for the TableScan has been added.
* A new fitting model for the RadixJoin has been added.
* Added missing code for changeDependency + regression tests.
* Added some explanation for the model used.
Addin Profiling Path option to Settings and SettingsOp
Merge pull request #251 from lordgeorg/core-fix

fix for possibly invalid core calculation
fix for possibly invalid core calculation
Merge pull request #289 from hyrise/feature/profiler_helper

Addin Profiling Path option to Settings and SettingsOp
Merge pull request #285 from kaihowl/pullrequest/dynamic

Bugfixes / Improvements to DynamicPriorityScheduler