fix($rootScope): ng-repeat can't handle NaN values. #4605

$watchCollection checks if oldValue !== newValue which does not work for NaN. This was causing
infinite digest errors, since comparing NaN to NaN in $watchCollection would always return false,
indicating that a change was occuring on each loop.

This fix adds a simple check to see if the current value and previous value are both NaN, and
if so, does not count it as a change.

Closes #4605
docs($q): add mention of Antroid 2.x browser

The Android 2.x browser is not ES5-compatible in that it does not allow
use of reserved words as property names. This docs fix adds Android to the
note to the `$q` docs which already make it known that string property
notation should be used when using the `finally` method on `$q`.
docs($document): add a documentation example.

The $document docs are pretty empty, and this fills them out a bit. The example itself may not be
particularly useful, but it could be improved or removed later. Works for me.

Closes #6757
docs(tutorial): correct spelling mistake
fix(version-info): explicitly specify the remote

`git ls-remote --tags` assumes that you have a remote set up for your
current branch.  That isn't the case, at least for me, when I'm working
on local branches.  `grunt write` doesn't do the right thing in that
case (`git ls-remote --tags` bails out and the silent: true param makes
this a pain to debug.)  Prefer explicit to implicit.

Closes #6678.
chore(release): fix angularjs.org cdn script
test($rootScope): add assertion to test ensuring that NaN -> NaN does not throw

https://github.com/angular/angular.js/commit/fb6062fb9d83545730b993e94ac7482ffd43a62c implements a
fix for NaN values causing $watchCollection to throw an infdig error. This change updates the test
by adding an assertion which explains what is actually being tested a bit better, and may also
provide better information in the event that the test ever fails.

Closes #6758
chore(CHANGELOG.md): add changelog for 1.3.0-beta.3
chore(release): update cdn version