Update Datatables.php

Added filter_column function
Update Datatables.php

Indentation fixes
Update Datatables.php
Update Datatables.php
Update Datatables.php

Bugfixes... now it should be all right. Works for me.
Update Datatables.php

Small improvements, added some comments
Update README.md

Added filter_column description and example
Update Datatables.php

Applied fix #111
Update Datatables.php

Fixed count method to allow counting if "having" and "havingRaw" clause exists in query
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/Bllim/Datatables/Datatables.php
Better handling of havingRaw clause
Merge pull request #111 from ktunkiewicz/master

filter_column - versatile filtering method