fix($compile): Handle the removal of an interpolated attribute

Handle the removal of an interpolated attribute before the
attribute interpolating directive is linked

Closes #9236
Closes #9240
fix($animate): clear the GCS cache even when no animation is detected

$animate will cache subsequent calls to GCS in the event that the element
with the same CSS classes and the same parentNode is being animated. Once the
animation is started then $animate waits for one rAF before flushing the GCS
lookup cache. Prior to this fix, if GCS was unable to detect any transitions
or keyframes on the element then it would simply close the animation, but it
would not trigger the rAF code to flush the cache. This issue caused a bug
which made it difficult to detect why certain animations are not allowed to
fire if the element didn't contain any CSS-based animations beforehand.

Closes #8813
fix($animate): abort class-based animations if the element is removed during digest

Prior to this fix, if the element is removed before the digest kicks off then it leads
to an error when a class based animation is run. This fix ensures that the animation will
not run at all if the element does not have a parent element.

Closes #8796
docs($injector): fix syntax error

There was a missing parenthesis in $injector test example

Closes #9469
fix($browser): Cache `location.href` only during page reload phase

Adds caching for url changes while a reload is happening,
as browsers do not allow to read out the new location the browser
is navigating to.

Removes unnecessary caching from $browser, as IE7-IE9 all
have the new hash value in `location.href` after changing it.
There was a wrong assumption in the previous version of this code
introduced by dca23173e25a32cb740245ca7f7b01a84805f43f and d70711481e6311c9cd283d650f07ca0cca72ecc2.

Adds more tests for #6976
Fixes #9235
Closes #9455
feat($location): add support for History API state handling

Adds $location state method allowing to get/set a History API state via
pushState & replaceState methods.

Note that:
- Angular treats states undefined and null as the same; trying to change
one to the other without touching the URL won't do anything. This is necessary
to prevent infinite digest loops when setting the URL to itself in IE<10 in
the HTML5 hash fallback mode.
- The state() method is not compatible with browsers not supporting
the HTML5 History API, e.g. IE 9 or Android < 4.0.

Closes #9027
WIP: remove changeCounter from $location

there are tests failing after this change, need to check if they are legitimate failures