update gantry to v4.1.7

Release Notes - Gantry Joomla Framework - Version 4.1.7

Bug
• article index styling issue in j2.5
• pagination/navigation button issues
• Notice: Undefined index: responsive-menu
• print/email/edit icons all show twice in j3.0.3
• font awesome icon error in J3.0.3 frontpage editor article modal
• pagination leftovers
• Colors passed on get for setbyurl is broken