Let's get us some tooltips!

* Create a new "base" View - FormView - useful for doing form validation.
* A FormView must provide three functions - isFormValid, showValidationErrors and submitForm.
* When a form element is invalid, it's containing .form-row recieves a title which is displayed as a tooltip.
* Change all Views that use forms to be a FormView
* Add a ton of tests.

fixes #252
Generic form validation, support for tooltips above and below the input elemnts & cleanup.

* Add tooltip/tooltip-below classes to tooltip containers.
* Add generic form validation in form.js with the ability for descendent views to override using strategy methods.
* MOAR TESTS!
Add red outlines to form elements when invalid.

* Remove the outline as soon as the user changes the value of the field.

fixes #435
tweaked tooltip spacing to avoid overlap
fix the show button border to handle the keyboard accessibility updates
Add helpers.js with requiresFocus, use that in form.js when checking for focus.
Merge pull request #464 from mozilla/issue-252-tooltips

tooltips and generic form validation