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.
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