Decrease the min supported serrano version to 2.0.16

This solves the issue with the exporter not looking for cookies for
progress tracking. The exporter was requiring that version 2.0.16 was
supported but with a minSerranoVersion of 2.0.18 this check was failing.
2.1.6 Release
2.1.7 Bump
Merge branch '2.1' into 2.2
Remove post-help line from grunt release task

The changelog module was removed so this is no longer applicable.
Wrap initial demo contents in element

This ensures the router can properly clear out the contents using
the $(...).children() method (due to an IE8 oddity).