Heatmap containerization

Introduces 'resettable' directive which runs at super high priority
and listens for the '$reset' event on the scope upon which the
element is stored to its pristine condition via a full element
transclude.

closes #159

closes #233

- Drop deform from angular app -- this was too confusing and strange
  and makes it harder to pull the front-end application out of the
  repository.
- Make the sheet much more attractive by tying it to the toolbar
  in a clearer way and toggling between "Sign in" and the close 'X'.
- Start to normalize the way errors are handled in form submissions
  on the back-end by offloading basic validation messaging to the
  front-end, removing the need to constantly re-render the forms.

Still to do: flash messages (#233)

fixes #228

closes #219
closes #182
closes #162
closes #150
closes #104

Chrome is bugging about it and won't submit the form on the
first 'enter' press.

In the editor, should show detail view of the new annotation,
while, in the detail viewer, should stay put.

... to arrive at parity with h/develop.

I find this easier to read.

"Unless there's a detail being shown, calculate the dynamic bucket,
but if there's no heatmap, then show nothing."