2.4 Release

Mostly a bugfix release.
Support for FOR UPDATE and LOCK IN SHARE MODE in selects
Support for join in delete()
rawQuery() should populate count now
Added '', ' and * chars for orderBy and groupBy
Throw an exception if connection were failed
JsonBuilder() should return $this
onDuplicate() should return $this
fix for nestJoin on multiple joined tables
dbObject: Set primary key on create if primary key is set, but empty
dbObject: visibility changes for bunch of private functions