Add rowSpan DOM property
Add more helpful invariant if you're updating an unrendered component
Add missing "use strict" statement to pass lint

Test Plan:
grunt lint; grunt test
Community round-up #7

http://fooo.fr:4000/react/blog/2013/08/26/community-roundup-7.html
Update the tooling page to include pyReact, react-rails and react-page
Fix capitalization of Tooling Integration page
Add pagination to blog

- Add pagination
- Display full content in /blog
- Truncate Recent posts
- Add permalink that lists all the blog posts
- Add spacing and bullet around recent posts to make it more readable
Support props for <meta> elements.

`content`, `httpEquiv`, `charSet` are all needed. We're currently
working around this in `react-page`.

`content` is the risky one here since we previously supporting using
`content` to set the text content. We removed support for that in
e9980412296b6469f39605f48ea527776d7ac718 so the risk is minimal, there
just might be some lingering old code.

Fixes #292

Test Plan: Visit `data:text/html,<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" charset="utf-8"></head>`

```
var m = document.querySelector('meta');
m.httpEquiv; // Content-Type
m.httpEquiv = 'foo';
m.httpEquiv; // foo

m.charset; // undefined
m.charSet; // undefined
m.getAttribute('charset'); // utf-8
m.setAttribute('charset', 'bar');
m.getAttribute('charset'); // bar

m.content; // text/html; charset=utf-8
m.content = 'baz';
m.content; // baz
```
Allow getInitialState() for mixins

Today mixins can't easily be stateful because they can't provide getInitialState(). This allows multiple getInitialState() methods as long as they don't return objects that have conflicting keys. In that case, we throw.
Sync objMap from upstream
Update package dependencies

Sometimes I look at https://david-dm.org/facebook/react
[docs] Small tweaks as reported in comments

* highlight `</form>`
* use correct id in `getElementById` call
Don't trigger mouse events on native button elements that are disabled

This adds a `ReactDOMButton` module that shims the native `<button>` React component so it doesn't receive mouseup, mousemove, mousedown, click, or double-click events when its disabled property is truthy.
Change vendored module isDOMNode -> isNode
Make React batching strategy injectable
React.isValidClass

Sometimes you may need to detect if a value is a valid React class constructor. This enables that and prevents future consumers from getting caught in the trap of depending on an internal implementation detail we might change.

Currently this works for classes created with `React.createClass` as well as `React.DOM.*`.
Make ReactDefaultPerf work server-side

We were reading from window which was throwing when ReactDefaultPerf was injected.
Expose the instance cache

We need access to the instance cache for debugging tools. Ideally we want to
expose a more stable and supported interface but this seems like a quick win,
for now.
Tutorial: show how to add showdown.js
sync with tastejs todomvc