docs(angular.equals): fix simple typo

- JavasScript -> Javascript

Closes #4323
fix(ngTouch): add $event to ng-swipe

Existing documentation implies that an Event object should be available
as `$event` on swipe directives, which previously was only working for
`ng-click`.

Closes #4071
Closes #4321
docs(cookbook/adv_forms): simplify example

Pass the `$index` directly to the `removeContact` function, instead of
searching for it in an expensive forEach loop.

Closes #4320
fix(ngTouch): ngClick does not pass touchend event when jQuery is loaded

The trigger handler event in jqLite takes an event object as a second
parameter, but jQuery requires an array of parameters. This is causing
the touchend event to not come thtough in the click handler when jQuery
is loaded.
chore(travis): enable Firefox again

This updates karma-sauce-launcher plugin, which fixes the issue we were having (it uses the latest version of wd).