docs(guide): add ng-book link to books

Closes #4792
docs(guide): add ng-newsletter to weekly updates link

Closes #4793
docs($http): improve $http's caching documentation

Make the possibility to pass a custom cache instance to $http more obvious.

Closes #4803
docs(ngdoc): clarify extra module installation options

Closes #4811
docs(guide/understanding_controller): fix incorrect property reference

Correct " model property `spice` " to " model property `customSpice` " to match the code sample

Closes #4812
docs(guide): fix typo

Closes #4821
docs(errors/compile/tplrt): display html block as code

HTML elements were getting parsed by as HTML elements

Closes #4827
docs($httpBackendSpec): fix typo in spy name

Closes #4830
docs(contribute): justify note about elevation on Windows

This message needs a justification. Without one, it's like asking somebody
on *nix to run everything under sudo 'just because'.

Closes #4832
docs(guide/scope): ensure demo CSS styles work in JSFiddle and Plunker

The CSS styling in the ng-scope demo was using CSS classes (`.doc-example-live` and
`.show-scope') to prevent the styling for the demo from affecting the entire page.
Unfortunately elements containing these classes did not appear in JSFiddle or Plunker
when you click edit.

This fix moves the `.show-scope' class inside the demo (renaming it `.show-scope-demo`)
and removes the reliance on `.doc-example-live` altogether.

Closes #4838
docs(guide/scope): correct scopes example

Remove reference to `employee` property as it's not used in the example.
Inject and use `$rootScope` applying `department` property as mentioned in text.

Closes #4839
docs($compile): Explain that post-link functions run in reverse order.

Update the $compile docs to mention the change introduced in #4266.

Closes #4843
docs(tutorial): minimum required node.js version is 0.10
fix(urlUtils): made removal of windows drive from path safer

Prior to this fix, the urlResolve method would automatically
strip the first segment of a path if the segment ends in a colon.
This was to correct undesired behavior in the $location service
using the file protocol on windows in multiple browsers (see #4680).

However, there could be cases where users intentionally 
have first path segments that end in a colon 
(although this conflicts with section 3.3 of rfc3986).

The solution to this problem is an extra check to make sure
the first path segment of the input url does not end with a colon,
to make sure we're only removing undesired path segments.

Fixes #4939
feat($parse): revert hiding "private" properties

Hiding `_*` properties was a feature primarily for developers using Closure compiler and Google JS
style. We didn't realize how many people will be affected by this change.

We might introduce this feature in the future, probably under a config option, but it needs more
research and so I'm reverting the change for now.

This reverts commit 3d6a89e8888b14ae5cb5640464e12b7811853c7e.

Closes #4926
Closes #4842
Closes #4865
Closes #4859
Closes #4849

Conflicts:
	src/ng/parse.js
docs(ngBindHtml): fix dependency for Plunker and JSFiddle in example

The `<doc:example>` directive does not load up the dependencies correctly.
Using the `<example>` directive, with `<file>` elements fixes this.

Closes #4951
docs(downloading): fix invalid filenames and add missing modules

Closes #4846
docs(misc/contribute): fix internal links

Closes #4848
docs(tutorial/step-12): fix incorrect code filename

Closes #4860
docs(resource): fix grammatical issue

'Case' should be the plural 'cases' since it is talking about multiple possible cases rather
than a single case. For slightly more info, see the section 'When words like "none" are the
subject' in this article: http://writing.wisc.edu/Handbook/SubjectVerb.html