Add left-side TOC to how_to and reflections page
css for slider prebuffer progress
more 'thoughts' content
Merge branch 'thoughts-update'
activate user voice
thoughts follow up to ddca2816 minor edit
add reworked sharethis, refs #460
thoughts - layout tuning, randomize order
uservoice widget update
Merge pull request #532 from jj0hns0n/issue-456

Add left-side TOC to how_to and reflections page
enable django messages in templates, tweak
add flagging app, refs #470, thanks jj0hns0n
minor template cleanup rel to #516
Keyword upgrades - refs #518
feedback for when topic is changed, refs #513
friendlier not-found-page, refs #350
flagging - basic email send
flagging - add flag language
flagging - allow comment flagging
stab at opengraph meta tags