* ValidatePositions can now be used with Stores
  * GroupByScan without Hashing for ops without grouping
  * Fixing bug in tablebuilder that would build a wrong layout, but correct view on top of it
  * Fixing default merge settings in Store, to not use compression
  * Made the code compiling without precompiled headers by including the necessary includes
Merge pull request #176 from hyrise/feature/updates_to_querying_in_tx

Feature/updates to querying in tx
introduces sql-parser
basic string parsing: remove whitespaces
adds new Statement class
introduces Statement::parse() and statement_ptr_t
parser now considers String input ("...")
adds keyword registration and select statement/keyword
moved select into subfolder
usufull main ...
[wip] adds ConstantStatement for constant expressions like numbers
deeper hierarchy and more constant expressions evauable
registration of kaywords in one file