feat(jqLite): add private jqDocumentComplete function

This helper function can be used to execute a callback only after the
document has completed its loading, i.e. after the `load` event fires
or immediately if the page has already loaded and
`document.readyState === 'complete'`.
feat($anchorScroll): support a configurable vertical scroll offset

Add support for a configurable vertical scroll offset to `$anchorScroll`.

The offset can be defined by a specific number of pixels, a callback function
that returns the number of pixels on demand or a jqLite/JQuery wrapped DOM
element whose height and position are used if it has fixed position.

The offset algorithm takes into account items that are near the bottom of
the page preventing over-zealous offset correction.

Closes #9368
Closes #2070
Closes #9360
chore(docs): apply the anchorScroll offset feature to the docs app

Closes #9360
docs(guide/unit-testing): use whitespace to improve readability

☆.。.：・゜☆ Merci (◜௰◝) ☆.。.：・゜☆

Closes #9572
refactor($interpolate): cleanup switch statement, curlies unnecessary

Closes #9530
fix($parse): stabilize one-time literal expressions correctly

Change `oneTimeLiteralWatchDelegate` to use the last value in the
digest cycle to check if the literal value is stable
chore(jqLite): remove leftover attachEvent/detachEvent from tests
fix($browser): account for IE deserializing history.state on each read

IE 10-11+ deserialize history.state on every read, causing simple comparisons
against history.state always return false. Account for that caching
`history.state` on every hashchange or popstate event.

Also:
1. Prevent firing onUrlChange callbacks twice if both popstate and hashchange
event were fired.
2. Fix the issue of routes sometimes not firing the URL change in all browsers.

Closes #9587
Fixes #9545
refactor($animate): use $animate.$$setClassImmediately to save code
refactor($animate): clean up core $animate code
chore(npm): update npm dependencies

Some of previous dependencies versions (e.g. Karma) didn't work with
Node 0.11.14, see:
https://github.com/karma-runner/karma/pull/1182

The only dependencies not updated in this commit are:

1. grunt-jscs-checker: its
rules have changed a lot so it will require more work to use the newer
version
2. gulp-jshint: the update breaks docs linting, it requires investigation

Closes #9571