fix(typeahead): stop keydown event propagation when ESC pressed to discard matches

Closes #243
fix(tabs): remove superfluous href from tabs template
chore(build): Add grunt-contrib-watch task for grunt v0.4
feat(tooltipProvider): added appendToBody option for $tooltip
feat(tooltip): added popup-delay option
feat(tooltip): added appendToBody to $tooltip

Tooltips and popovers can now be appended to the body of the HTML
document instead of directly after the element on which the directive
was invoked, by setting `appendToBody` to true through
$tooltipProvider.options().

The tooltip specs were refactored slightly to bucket all
provider-related specs under a single `describe` for cleanliness.
fix(typeahead): correctly render initial model value

Closes #203
feat(typeahead): support the editable property

Closes #269
fix(dialog): set _open to false on init
refactor(dropdownToggle): cleanup code and increase legibility
chore(build): Make test-config not autoWatch, speed up grunt watch task
fix(alert): don't show close button if no close callback specified
fix(collapse): remove reference to msTransition for IE10

In IE10 msTransition exists but msTransitionEnd never fires. IE10 does however support standard transitionend.
Since IE<10 does not support transitions this line can be removed entirely.

This has already been done in Twitter Bootstrap. Reference here: https://github.com/twitter/bootstrap/pull/4166
docs(dialog): corrected resolve example
demo(accordion): minor demo changes
demo(accordion): fix typo in demo's readme
feat(tooltip): added tooltip-html-unsafe directive

The directive displays the unsanitized HTML in the tooltip instead of
the escaped text.

The $tooltip service has been modified to allow a little more
flexibility in terms of the prefix used on the $observe'd attributes.
For example, the `tooltip-html-unsafe` directive needs to be called as
written, but it would be nonsensical to require all other attributes
(like animation or placement) to also use that verbose prefix as opposed
to the simpler and more familiar `tooltip-` prefix. The service now
allows independent specification of the name and its prefix.

Lastly, the docs for the tooltip and popover have been updated to show
their available optional attributes.

Closes #246
refactor(pagination): simplify math
chore(changelog): update changelog to the new syntax
chore(build): add changelog task for grunt