Change how 'open' events are logged.
Now include default notebook opens
Make more info available to tracking services (still need to change
tracking services to consume it)
Fix and change tracking service about 'open' events logging
The code that determines notebook type was still using the logic from before the URL scheme change
Under current scheme, the notebook type has 2 parts: uriType and
notebook format. The tracking service now record the notebook format.
Issue #360 was logged to identify what exactly should be logged.
Add event logging for outputdisplay usage
Merge remote-tracking branch 'origin/master' into alee/metrics
Merge pull request #372 from twosigma/alee/metrics

Make Beaker able to log more to metrics
Fix capitalization of "LaTeX" in READMEs and tutorial
Merge pull request #373 from bwignall/tex

Fix capitalization of "LaTeX" in READMEs and tutorial
Move code-cell behaviors according to design

Implements a basic version of the codecell styling
that does not remove any functionality however brings it closer
inline with the implemented design.
Remove side click behavior from codecells
Move right cell menu according to new design.
Add a test for showing the codecell menu
Test toggling a code cells visibility
Move cell menu items into top level header
Update style of the new cell indicator.
Test expanding the newCell menu
Update dropdown menu styles.
Update new app header styles.
Add a compile task for scss
Replace app.css with app.scss
Add a watch task for dev