[config.default] Added agangcg database details.
[DatabasePDOHelper] Added require statement for config.default.php  file. Database details are stored in this config file.
[sql/] Added sql creation scripts for the 'user_has_group' and'group_member_state_lookup' tables.
Turned persist and update to true because mxit_options aren't avaiable when mxitUser is created
removed debug log lines
[MxitUser] Migrated sql command/queries from PDO to wpdb (Wordpress DB object).

Conflicts:
	MxitUser.php
[DatabasePDOHelper] Fixed require_once directory given. Added dirname(__FILE__)