added a roll model.
Implemented a rolls tab with roll history, and a generic roll input.

Some minor infrastructure changes to support specifying roll titles independent of the button text; as well as a good roll history system. This is the first half of #67.
Fixed issue with rolldice, and added ngEnter directive.
Added support for pressing enter in the generic roll box.
Fixed a styling issue.
Added framework for general rolls.

Added styling, and some of the basic framework.
Can now add and remove rolls.
added edit support.
Improved adding and editing.

Concerns were raised that adding and editing were confusing, because it wasn't clear what was expected, or what was going on. I improved this by adding some additional text, changing button color and changing the placeholders to examples.
Added tooltips for edit, remove.
Added the ability to add an icon to roll buttons.
Merge pull request #70 from Morgul/feature-ccase-rolls

Improved Rolls