Fix ChangeEventPlugin for IE8 and IE9

This fixes a bug with `ChangeEventPlugin` in IE8 and IE9. The extend of this bug includes:

 - On IE8, not firing `onChange` immediately after `value` of an input is changed.
 - On IE9, not firing `onChange` when backspacing.
Faster Listener Deletion

Whenever a component is unmounted, we delete all listeners that might have been attached. This sucks because most applications, Facebook included, do not use every listener. There's a lot of wasted computation, especially if many components are mounted and unmounted.

This changes `deleteAllListeners` to more delete listeners more efficiently.
Inject `ReactDOMInput`

Changes `<input>` in React to use `ReactDOMInput` which supports `value` and `defaultValue` instead of the current, arguably broken `value` behavior.
Add finally block for clearing ReactUpdates state

If any component throws during reconciliation any subsequent reconciliation will break badly because ReactUpdates will be in an inconsistent state.
Add a finally block to prevent this.
update docs
Add `hidden` attribute to DOM properties.
Merge pull request #153 from lrowe/patch-2

Add `hidden` attribute to DOM properties.
Community Round-up #4
Merge pull request #157 from vjeux/communit_4

Community Round-up #4