feat($compile): explicitly request multi-element directive behaviour

Directives which expect to make use of the multi-element grouping feature introduced in
1.1.6 (https://github.com/angular/angular.js/commit/e46100f7) must now add the property multiElement
to their definition object, with a truthy value.

This enables the use of directive attributes ending with the words '-start' and '-end' for
single-element directives.

BREAKING CHANGE: Directives which previously depended on the implicit grouping between
directive-start and directive-end attributes must be refactored in order to see this same behaviour.

Before:

```
<div data-fancy-directive-start>{{start}}</div>
  <p>Grouped content</p>
<div data-fancy-directive-end>{{end}}</div>

.directive('fancyDirective', function() {
  return {
    link: angular.noop
  };
})
```

After:

```
<div data-fancy-directive-start>{{start}}</div>
  <p>Grouped content</p>
<div data-fancy-directive-end>{{end}}</div>

.directive('fancyDirective', function() {
  return {
    multiElement: true, // Explicitly mark as a multi-element directive.
    link: angular.noop
  };
})
```

Closes #5372
Closes #6574
Closes #5370
Closes #8044
Closes #7336
docs(guide/forms): fix controller name in example

The "Binding to form and control state" sample had the wrong controller name

Closes #8206
docs(misc core): fixed broken angular.copy example

The module was not being registered, and this broke the example for who knows how long!

Closes #8218
revert: chore(travis): get npm dependencies from npm-bundle-deps

This commit was causing some issues with CI testing, so it's being temporarily removed until that's
resolved.

This reverts commit 8881606cd93cc42cb8295c0d63dac7b81e6cc8cc.
test($http): ignore date-toJSON test if running in IE8

IE8 does not implement Date.prototype.toISOString(), which is necessary for this feature. The
feature still works if this method is polyfilled, but these tests are not run with polyfills.

(Added to master branch to keep tree in sync)
fix($cookie): use decodeURIComponent instead of unescape for cookie reading

the self.cookies method in $browser was using escape and unescape to handle the cookie name and value. These methods are deprecated and cause problems with some special characters (€). The method has been changed to use the replacement encodeURIComponent and decodeURIComponent.

Closes #8125
docs($compile): fix template and replace properties' docs

Closes #8062
fix(ngSanitize): follow HTML parser rules for start tags / allow < in text content

ngSanitize will now permit opening braces in text content, provided they are not followed by either
an unescaped backslash, or by an ASCII letter (u+0041 - u+005A, u+0061 - u+007A), in compliance with
rules of the parsing spec, without taking insertion mode into account.

BREAKING CHANGE

Previously, $sanitize would "fix" invalid markup in which a space preceded alphanumeric characters
in a start-tag. Following this change, any opening angle bracket which is not followed by either a
forward slash, or by an ASCII letter (a-z | A-Z) will not be considered a start tag delimiter, per
the HTML parsing spec (http://www.whatwg.org/specs/web-apps/current-work/multipage/parsing.html).

Closes #8212
Closes #8193
test(filter): fix typo in descriptions

Two descriptions contain typo's to the word predicate.

Closes #8004
test(jqLite): make iframe contents() test less flaky

Closes #8157