fix(mocks): remove usage of $animate.flushNext in favour of queing

The flushNext method of testing is difficult and highly coupled with the behavior
of ngAnimate's $animate workflow. It is much better instead to just queue all
$animate animation calls into a queue collection which is available on the $animate
service when mock.animate is included as a module within test code.
fix(mocks): rename mock.animate to ngAnimateMock and ensure it contains all test helper code for ngAnimate

Closes #5822
Closes #5917
chore(travis): remove double bower install to test if it's still needed

We did this due to travis-ci/travis-ci#1293 but since it's possible that this hack is not needed, I'm removing it.

If it turns out that we do need it still then we should ping the travis issue and revert this commit
docs(injector): correct typo in example

$provide misused into $provider

maybe this should be corrected I think

Closes #6146
docs(misc): fix typo in "getting started" docs

changed "building and application" to "building an application"

Closes #6156