Merge pull request #395 from edx/giulio/peer-grading-style-release

Giulio/peer grading style release
tracking in idashboard should only log json-serializable objects
use unicode instead of str for casting track.views args in idashboard
Merge remote-tracking branch 'origin/giulio/peer-grading-style-release' into edx-west/release-candidate-20130711
put block around main_vendor js in main_django.html

should be a no-op for edx-east, but allow edx-west to remove
vendor.js with a blank {% block %}
in our password_reset_confirm.html to fix a bug
copy over password_reset_confirm.html back from master

because we've moved our password_reset_confirm.html into the theme repo.
This reduces edx-west diff with master.
moving initial openeded content to placeholder instead of value
re-added textarea content with conditional for review visibility
first round of unflag confirmation behavior
added simple confirm dialog for unflagging