docs(guide/ie): add info about what IE versions are supported

Added text from https://github.com/angular/angular.js/issues/4974

Closes #5070
docs(faq): update compressed and minified file size

Closes #5058
docs(guide/unit-testing): minor style and grammar changes

Closes #5057
chore: use temporary version of grunt-jasmine-node

This should be reverted once https://github.com/jasmine-contrib/grunt-jasmine-node/pull/33 gets merged in the upstream repo.

It fixes the problem where Grunt does not fail the build, even though there are failures.
See https://travis-ci.org/angular/angular.js/builds/14329011#L2366
test(docs): fix the failing specs

Because Grunt was not failing the build, we didn't noticed these failing specs.