Adds basic SQL Interface for SELECT, WHERE and GROUP BY.

added SQLEndpoint class

added sqlparser skeleton

added first version of sql parser

pulled newest version for sqlparser

started implementing sql interface into requestParseTask

put existing sqlparser functionality into SQLQueryParser

performing table load on sql statements from_clause

added projection scan for selection list

updated sql parser vesion

removed obsolete sqlendpoint

added names and ids to operators

implemented equals predicate to be executed as SimpleTableScan

added support for AND, OR, <, > expressions in where clause

updated to newest parser version

added additional predicate support

some cleaning up

now supporting like operator and sql comments. updated parser

update sql parser. not supports import statements

created SQLStatementTransformer class. refactoring

implemented group by in sql. major update

integrated create statement. improved error handling to throw exceptions

added aliases for group by

documentation and error handling

implemented limit clause

implemented union clause
Merge pull request #386 from hyrise/feature/sql_interface

Feature/sql interface