First version semi-working with Simple Bridge 2.0

File uploads still broken
Add note about moving callout module
Change to nitrogen as the callout module
Merge branch 'master' into ws

Conflicts:
	rebar.config
Fix config for recent simplebridge changes
Merge branch 'live' into ws
Merge branch 'live' into ws
Merge branch 'master' into ws
Merge branch 'master' into ws
Ensure bert is loaded by everyone
Postback demo showing the effects of slow postbacks
Always use bert. Fix bug on wizard demo.

Also make simple comet demo be tolerant of code changes
Update security login demo to demonstrate enter_clicks
Add smart extensions demo
Rebar deps back to master