converts a TERP link in a module to an iframehosted by Tutor; currently the demo Tutor site is used; some basic styles applied to the iframe
whitespace removal to please travis
more specific css selector for TERP iframe replacement, can also still do configurable setting if needed
Merge pull request #580 from jpslav/terp-link-to-iframe

converts a TERP link in a module to an iframe hosted by Tutor