- Move general utility functions into ClefUtils
- use render_template instead of include where possible
Merge pull request #70 from clef/general-refactoring

General refactoring
Merge branch 'invite-users' into two-point-oh

Conflicts:
	includes/class.clef-admin.php
	includes/class.clef-base.php
	templates/admin/settings-header.tpl.php