Remove Ardent's workaround, Ardent updated. [hasSessionStore error resolved]

Per https://github.com/laravelbook/ardent/pull/154 Ardent updated and stable. No need for workaround. Should resolve #91 and #94. See Also comments on https://github.com/Zizaco/entrust/commit/d030af26975630912d1e1f4bf9da6e6838eb00f9