javascript fix. ui tweak.
create menu
navigation and action buttons
collection column edits
Merge branch 'unstable' of git.ccnmtl.columbia.edu:mediathread into unstable
new sources
size of recommended source thumbs
recomended sources
important sources edit
stuff
tour styles
source imgs
new source icons
final edits
Fixing logic for Add To My Collection
Homepage help menu -- adds a tour option.
Don't show the tour if the user has already taken it.
bug fixes -- public url on homepage + FF switcher arrow
respond links
Hooking up respond to assignment links