Fix docs for React.Children.map, .forEach, .only.
Add download and hrefLang attributes

Fixes #1115.
Add media element attributes

Fixes #1124.

I didn't add `volume` because it requires more complicated logic to control properly and I didn't add `paused` because to set it we need to call play() or pause() -- perhaps a mutation method is appropriate.
Merge pull request #1116 from spicyj/gh-1115

Add download and hrefLang attributes
Update copyrights for 2014.

grep -rl 'Copyright 2013 Facebook' static_upstream | xargs perl -pi -w -e s/Copyright 2013 Facebook/Copyright 2013-2014 Facebook/g;'

Not going to check in a script to do this since it will just change every year.
Closes #1006
Merge pull request #1128 from spicyj/media-attrs

Add media element attributes
Don't break if no attribute value

Fixes the transformation of things like `<button disabled>`.
Merge pull request #1130 from spicyj/if-attr-value

Don't break if no attribute value
Merge pull request #1100 from plievone/mapchildren-docs

Fix docs for React.Children.map, .forEach, .only.
add ReactCSSTransitionGroup to addons and document it
remove child factories
docs fixes
Add ReactTestUtils to addons
fix docs
Merge pull request #1059 from petehunt/rtg-docs

Document ReactCSSTransitionGroup
Merge pull request #1112 from petehunt/testutils-addons

Add ReactTestUtils to addons
clone docs
Merge pull request #1132 from petehunt/docs-clonewithprops

clone docs
Simpler ReactTestUtils.simulateEventOnDOMComponent
Simulate synthetic events using ReactTestUtils

Most of the time this is what you want to do, so I've renamed what was Simulate to be SimulateNative.

Now Simulate.change does what you expect, so this fixes #517 and fixes #519.