Rename 'Connexions' to 'OpenStax CNX'
Rename instances of 'subcollection' to 'section'
Rename instances of 'Collection' to 'Book' and 'Module' to 'Page'
Fix bug where toc would not remember if a section was expanded in some cases
Shorten 'Latest Revision'
Merge pull request #364 from Connexions/renaming

Rename 'Collection', 'Module', and 'Subcollection'