feat($compile): allow SVG and MathML templates via special `type` property

Previously, templates would always be assumed to be valid HTML nodes. In some cases, it is
desirable to use SVG or MathML or some other language.

For the time being, this change is only truly meaningful for SVG elements, as MathML has
very limited browser support. But in the future, who knows?

Closes #7265
chore(travis): use npm cache
revert: test(ngModelOptions): ensure input has focus in e2e tests

This reverts commit 8d38ec38921bf887189eb31b07855ca987beff47.
The protractor tests for ng-model-options were failing locally on Chrome
for me but this commit breaks the tests on Firefox.
chore(travis-build): don't re-package when testing docs

Since .travis is already running `grunt package` in the `before_script`
block there is no need to run it again when testing the docs.
chore(travis): disable captureTimeout

All of the recent failures were caused by too much load on SL, not
an actual problem.

I think a proper solution will be:
https://github.com/karma-runner/karma-sauce-launcher/issues/37
chore($http): remove deprecated responseInterceptors functionality

Code cleanup! response interceptors have been deprecated for some time, and it is confusing to have
two APIs, one of which is slightly "hidden" and hard to see, which perform the same task. The newer
API is a bit cleaner and more visible, so this is naturally preferred.

BREAKING CHANGE:

Previously, it was possible to register a response interceptor like so:

    // register the interceptor as a service
    $provide.factory('myHttpInterceptor', function($q, dependency1, dependency2) {
      return function(promise) {
        return promise.then(function(response) {
          // do something on success
          return response;
        }, function(response) {
          // do something on error
          if (canRecover(response)) {
            return responseOrNewPromise
          }
          return $q.reject(response);
        });
      }
    });

    $httpProvider.responseInterceptors.push('myHttpInterceptor');

Now, one must use the newer API introduced in v1.1.4 (4ae46814), like so:

    $provide.factory('myHttpInterceptor', function($q) {
      return {
        response: function(response) {
          // do something on success
          return response;
        },
        responseError: function(response) {
          // do something on error
          if (canRecover(response)) {
            return responseOrNewPromise
          }
          return $q.reject(response);
        }
      };
    });

    $httpProvider.interceptors.push('myHttpInterceptor');

More details on the new interceptors API (which has been around as of v1.1.4) can be found at
https://docs.angularjs.org/api/ng/service/$http#interceptors

Closes #7266
Closes #7267
chore(package.json): add qq

e0375a61d03b489901b16d375b98a7f65db94af2 removed qq, but the changelog script still needs it
docs($anchorScroll): minor copyedit.

Singular-tense verb. Definite article.

Closes #7319
fix($httpBackend): Add missing expectHEAD() method

This was documented but not implemented.

With accompanying unit test to ensure the $httpBackend.expect*() methods exist.

Closes #7320
docs(guide/providers): minor edits
docs($injector): fix typos
chore(doc-gen): update to dgeni 0.3.0
fix($interpolate): don't ReferenceError when context is undefined

546cb42 introduced a regression, which would cause the function returned from
$interpolate to throw a ReferenceError if `context` is undefined. This change
prevents the error from being thrown.

Closes #7230
Closes #7237
fix(injector): invoke config blocks for module after all providers

This change ensures that a module's config blocks are always invoked after all of its providers are
registered.

BREAKING CHANGE:

Previously, config blocks would be able to control behaviour of provider registration, due to being
invoked prior to provider registration. Now, provider registration always occurs prior to configuration
for a given module, and therefore config blocks are not able to have any control over a providers
registration.

Example:

Previously, the following:

   angular.module('foo', [])
     .provider('$rootProvider', function() {
       this.$get = function() { ... }
     })
     .config(function($rootProvider) {
       $rootProvider.dependentMode = "B";
     })
     .provider('$dependentProvider', function($rootProvider) {
       if ($rootProvider.dependentMode === "A") {
         this.$get = function() {
           // Special mode!
         }
       } else {
         this.$get = function() {
           // something else
         }
       }
     });

would have "worked", meaning behaviour of the config block between the registration of "$rootProvider"
and "$dependentProvider" would have actually accomplished something and changed the behaviour of the
app. This is no longer possible within a single module.

Fixes #7139
Closes #7147
feat(NgMessages): introduce the NgMessages module and directives

The ngMessages module provides directives designed to better support
handling and reusing error messages within forms without the need to
rely on complex structural directives.

Please note that the API for ngMessages is experimental and may possibly change with
future releases.
docs(Attributes): ensure code sample is not escaped

Closes #6649
feat($interpolate): add optional allOrNothing param
fix(ngSrc, ngSrcset): only interpolate if all expressions are defined

BREAKING CHANGE

If `bar` is `undefined`, before `<img src="foo/{{bar}}.jpg">` yields
`<img src="foo/.jpg">`. With this change, the binding will not set `src`.

If you want the old behavior, you can do this: `<img src="foo/{{bar || ''}}.jpg">`.

The same applies for `srcset` as well.

Closes #6984
fix(ngSanitize): encode surrogate pair properly

The encodeEndities function encode non-alphanumeric characters to entities with charCodeAt.
charCodeAt does not return one value when their unicode codeponts is higher than 65,356.
It returns surrogate pair, and this is why the Emoji which has higher codepoints is garbled.
We need to handle them properly.

Closes #5088
Closes #6911
docs(ngModelOptions): correct typo

Closes #7335