fix for possibly invalid core calculation
Local Storage for Queries for better usability
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
Adding const ref values for index and move helper for pointer calculator
Merge pull request #281 from hyrise/feature/misc_fixes

Feature/misc fixes
Merge remote-tracking branch 'upstream/master' into feature/kh-pipelining