docs(guide): fixed *off typo in angular.injector example comment

Closes #5441
fix(forEach): allow looping over result of querySelectorAll in IE8

In IE8 the result object
of calling `node.querySelectorAll` does not have a `hasOwnPropery`
function. However, it should be usable with `forEach`.

Related to #5400.
fix($log): should work in IE8

In IE8, reading `console.log.apply` throws an error.
Catching this errow now.

Fixes #5400. Fixes #5147.
fix($parse): return 'undefined' if a middle key's value is null

Prior to this fix, $parse/$eval would return 'null' if a middle key in
an expression's value is null, when it should be expected to be undefined.

This patch tries to remedy this by returning undefined for middle values in
expressions, when fetching a child of that null value.

For example:

```js
// Given the following object:
$scope.a = {
  b: null
};

// $scope.$eval('a.b.c') returns undefined, whereas previously it would return null
```

Closes #5480
fix($compile): remove invalid IE exceptional case for `href`

It appears that this exceptional case was only valid for IE<8 and that for IE>=8 it
was actually causing a bug with the `ng-href-attr` directive on `<a>` elements.

Closes #5479
docs(ngEventDirs): adding quick examples for new events

Closes #5338
docs($injector): use correct spacing convention for CoffeeScript functions

This convention is exhibited by http://coffeescript.org/ and https://github.com/polarmobile/coffeescript-style-guide#functions.

Closes #5354
docs(tutorial/step-4): fix typo

Closes #5356
docs(booleanAttrs): add @priority to all the boolean directives

Closes #5361
docs(ngCloak): style name is ng-cloak, not ngCloak

Closes #5374
docs($interval): remind the developer to destroy their intervals

It is essential that users of `$interval` destroy the interval when they are finished.
Otherwise you can get memory leaks.
Often `$intervals` are used in directives or controllers and developers don't think
about what happens when the component is destroyed.
If a directive/controller scope is destroyed, then the $interval should be destroyed as well.
This could cause some issues with developers who assume that the interval will be cleared
for them when the scope is destroyed.

Closes #5377

I believe that the library could/should handle this as well, but thats another issue.
fix($compile) support templates with table content root nodes

If the first element in a template is a <tr>, <th>, <td>, or <tbody> tag,
the HTML compiler will ensure that the template is wrapped in a <table>
element so that the table content is not discarded.