A small fix for #402.

Refs #402.
remove cnx-style.css
refs #398: conditionally display the license link and the preview link
refs #398: simplify the last rev
Merge pull request #5 from tmsp1/master

remove cnx-style stylesheet
Merge pull request #7 from oerpub/ticket398

Ticket398
Merge pull request #4 from oerpub/ticket402

A small fix for #402.
Merge branch 'master' into ticket429