Share reconcile transaction in batched updates

Should make #1350 better and will also take away any performance hit from #1157.

Test Plan:
grunt test
Adds svg mask and pattern dom components
Added support for itemscope, itemtype, itemprop.
Updated documentation.
Use camelCase and declare MUST_USE_ATTRIBUTE.
Adds svg pattern and mask components
Flux blog post and tutorial
Merge pull request #1499 from vjeux/flux

Flux blog post and tutorial
update Flux tutorial link
Stylistic changes.
Fix minor typo
Update flux-todo-list.md

Fix broken link to todomvc-flux repo

@spicyj cla signed
Start Flux video at 10m21s
Merge pull request #1503 from dybskiy/patch-2

Update flux-todo-list.md
Add missing emitChange() to Flux docs
Preemptively error when required ES5 shim/shams are not available
todomvc-flux: Depend on uglify-js, not uglifyjs

Fixes #1505.

Confusingly, the uglify-js package provides the `uglifyjs` binary and `npm run-script build` didn't work if uglify-js wasn't installed globally; now it does.
Update Flux README to point at website post/docs
Merge pull request #1516 from syranide/es5err

Preemptively error when required ES5 shim/shams are not available
Merge pull request #1504 from spicyj/flux-621

Start Flux video at 10m21s