serve popcorn from our own server (pages over https)
enclose the li tags in ul (was causing html validation errors)
fixes #1853 make child static pages save as list view by default
enable editing ContentGroup in django admin
Merge pull request #1848 from Stanford-Online/jinpa-master-little-bit-of-lint

enclose the li tags in ul (was causing html validation errors)
Merge pull request #1839 from Stanford-Online/jbau-serve-popcorn

serve popcorn from our own server (pages over https)
Merge pull request #1854 from Stanford-Online/jbau-static-child-default-list

fixes #1853 make child static pages save as list view by default
Merge branch 'master' of http://github.com/Stanford-Online/class2go into dca_new_working2
Address Joe's concerns for this PR (#1852).