Current set of must-have SVG attributes / tag

The current set of SVG attributes / tag I felt like I needed
them absolutely for my React/SVG editor app.
Add tspan to JSX transform
Fix transition end detection for Android

Some Android versions have the "transition" and "animation" properties
set on element style objects despite not supporting un-prefxied animations
and transitions.  This change adds an additional sanity check to make sure
the correct event handlers are added for transition groups.
Actually fix transitioning to null

Test Plan: grunt fasttest
Update jsfiddles in thinking-in-react to remove onSubmit from forms
link to tagtree 'Thinking in React' video
Normalize and polyfill KeyboardEvent further, also MouseEvent+TouchEvent

KeyboardEvent now normalizes "charCode", "keyCode", "which" across all browsers
KeyboardEvent has partial "key"-support for KeyDown/KeyUp and full "key"-support for KeyPress.
KeyboardEvent, MouseEvent and TouchEvent now has "getModifierState", polyfill when not implemented.
Additional Flux documentation
Merge pull request #1476 from fisherwebdev/master

Additional Flux documentation
Add some backticks to flux docs
Typo
Merge pull request #1477 from KyleAMathews/patch-1

Typo in Flux example readme
Fixed a couple of issues with link to tagtree.tv video
Clean up Flux documentation and add more info about managing dependencies between stores
Merge pull request #1479 from fisherwebdev/master

Clean up Flux documentation and add more info about dependencies btwn stores
Merge pull request #1470 from hendrikswan/master

Link to tagtree 'Thinking in React' video - on master
Fix ASCII-art arrow alignment
Update Dispatcher.js

I think Array.filter expects a boolean return value, am I correct?
Update Dispatcher.js
Update Dispatcher.js