Fixed incorrect contributing instructions in README
Make examples grab codemirror / ACE from cdnjs instead af checking them in.

Also add README.md to examples dir.
Fix markdown.
Make examples more standalone (copy/pastable).

* Pull firepad from CDN.
* Remove example-helper.js script include.
* Clean up comments slightly.
Tweak release.sh instructions.
Set cursor to beginning after a setText or setHtml
Change examples to use `defaultText` argument
Let headless mode take a string path for nodeJS convenience
Add integration spec for defaultText
Basic integration test for sync event
Merge remote-tracking branch 'origin/master' into master-hammett

Conflicts:
	dist/firepad-min.js
	dist/firepad.js
	examples/example-helper.js
	examples/firepad.css
	examples/firepad.js