Handle className properly on SVG nodes

This strategy avoids a runtime check for every set (as opposed to using a mutation method).

Test Plan: Verify that changing className works on a div and a rect in latest Chrome, latest Firefox, IE9. Verify that the div works in IE8.
Merge pull request #1590 from spicyj/svg-classname

Handle className properly on SVG nodes
Fix tutorial to have exact translation of example

Fixes #903.
Sync upstream modules

crateObjectFrom is no longer used (was used in ReactPropTypes). Others are small changes.
Update findComponentRoot and processUpdates warnings for SVG

I ran into a really difficult-to-debug issue with a React app with SVG
elements. Christopher sat down with me for a while and we finally figured out
that the browser was moving non-SVG elements out of a parent `<svg>` node which
triggered the `processUpdates()` invariant. This updates the error message
thrown from there to include this scenario in the possible issues list.
[docs] Fix grammar
Reference Jest in TestUtils documentation.
Merge pull request #1620 from kmeht/jestDoc

Reference Jest in TestUtils documentation.
[Blog] One-year anniversary post
Merge pull request #1614 from chenglou/1-year

[Blog] One-year anniversary post
Typo: ClosureScript -> ClojureScript
Merge pull request #1627 from Enome/master

Typo: ClosureScript -> ClojureScript in latest blog post
Fix onLoad and onError on images

Fixes bug introduced in c62c2c5.

Test Plan: Tested that the onLoad event was properly triggered on an image. Didn't test onError but I can only assume that it works equally well.
Merge pull request #1632 from spicyj/img-load-error

Fix onLoad and onError on images
Add support for patternUnits attribute.

The patternUnits attribute defines how a pattern's coordinate system is
defined (x, y, width, height). This is particularly important when using
repeatable patterns in SVG. This commit adds this attribute to the lists
of known properties.
patternUnits is not necessary in fbtransforms
Set rules in SVGDOMPropertyConfig