do not start jsxc inside a frame (fix jsxc/jsxc#435)
do not start jsxc inside a frame (fix jsxc/jsxc#435)

owncloud/jsxc.chat,jsxc/jsxc.owncloud,owncloud/jsxc.chat,owncloud/jsxc.chat,jsxc/jsxc.owncloud,jsxc/jsxc.owncloud