perf(scope): 10x. Share the child scope class.

This change causes Scope.$destory to run 10x faster. I suspect
Scope.$new is significantly faster as well, but I didn't measure it.
docs(tutorial): clarify bower usage
style(Angular.js): remove redundant `_angular`

Going through the commit history on GitHub, the `_angular` is for noConflict mode,
the case where you have an old reference to a variable called Angular you want to preserve.

Here is the commit that added _angular in : https://github.com/angular/angular.js/commit/
12ba6cec4fb79521101744e02a7e09f9fbb591c4

This feature was later removed here:
https://github.com/angular/angular.js/commit/9faabd1ba0b1929785bcf166dc0ff60008e7c442

The variable 'made it through', it's redundant now.

Closes #7215
docs(ngMock): fix example for $http respond() helper with function as 1st param

The  `whenPOST` method should return a response object containing status, response body and headers.
If omitted the following error will be thrown:

`Uncaught TypeError: Cannot read property '2' of undefined`

The documentation doesn't make it very clear, so I think it will be appropriate to add it here.

Closes #6761
docs(guide/di): fix typo

Fixed a typo. "depenendencies" -> "dependencies"

Closes #7232
docs(tutorial/step_00): add correct description for attributes naming convention
docs(tutorial/step_09): fix typos

phonecatApp module had a dot instead of semicolon
fix($location): don't clobber path during parsing of path

Closes #7199
docs(changelog): release notes for 1.3.0-beta.7 proper-attribution
docs(tutorial/step-12): add info about app.css changes

Closes https://github.com/angular/angular-phonecat/issues/145
docs(tutorial/step-3): fix experiments

Closes https://github.com/angular/angular-phonecat/issues/142
chore(jshint): enforce jshint for tests

Closes #7264
docs(ngCookies): use GFM code-snippet rather than example tag

The example tag creates a big ugly white rectangle on the docs page, and this is not very helpful
and kind of looks bad. So GFM snippets are a better way to go.

This fix also removes the unnecessary example heading from the $cookieStore page, as there has not
been an example use of $cookieStore for 2 years now.

Closes #7279
docs(ngCookies): added example usage of cookieStore

Closes #7278
fix(grunt-utils): ensure special inline CSS works when `angular` is not a global

The build includes a little script to angular.js, which adds some CSS styles to
the page to support things like ngCloak. This script checks that angular is
not in CSP mode, but before this fix assumed that angular would be in the global
scope.

This commit, references `window.angular` instead of just `angular` because when
running angular in an environment where the top-level scope is not the window
(nodejs for example), we angular is actually a property of `window`.

Closes #7176
docs(select): improve naming of `c` variable in example

It was felt that `c` did not make it clear what the variable held. This
has been changed to `color` to match the ng-repeat expression above.
In turn the model value has been changed to `myColor` to prevent a name
collision.

Closes #7210
docs(guide/unit-testing): remove unwanted whitespaces

Closes #5395
docs(orderBy): clarify how sorting is processed

An API was passing me numbers as strings (ex. '8.25'), and I was noticing
weird sorting behavior with `orderBy` because it was trying to sort the
numbers alphabetically.

Closes #5436
docs(angular.Module): add link to `module.config()` docs

Add a link on where to find more info about how to use `module.config()`

Closes #6270
docs(guide): add another analytics library