fix(ngAnimate): fix cancelChildAnimations throwing exception

fix ngAnimate throwing exception in cancelChildAnimations on deletion of
element (ngAnimate's leave decorator) of repeated element when using
ng-include on this element.

Closes #4548
fix: don't inline css in csp mode.

Also add `angular-csp.css` to the resulting build.
chore(Grunt): use the latest Content-Security-Policy header in csp mode
chore(grunt): add jshint tasks
style: make jshint happy
chore(travis): run jshint task on Travis
fix(ngdocs): remove the side search bar

BREAKING CHANGE

The side search bar on the docs page has been removed in favor of the
top search bar.
feat(ngdocs): add forward slash shortcut key for search bar