link to public-facing site in admin.
added google analytics, segment.io client-side identification.
oops, no sentry.
added server-side analytics with segement.io.
wrong method called on activity.
only track create actions.
removed segment.io for now.
Merge pull request #119 from noted/59-segment

Added Google Analytics
sentry integration for production.
Merge pull request #120 from noted/61-exceptions

Exception tracking with Sentry.
view sources associated with notes (closed #63).
view bibliography of project.
Merge pull request #121 from noted/73-bibliography

View bibliography of project
specs for bibliography page.
api for updating notes.
save note with ajax.
autosave and message when save fails.
Merge pull request #122 from noted/78-ajax

Save notes with ajax, autosave
oops, forgot logging.
make note source ids an empty array instead of "null" in api (fixes #123).