Fix #211 (more howto in example)

- Explain the autojoin parameter a bit
- Add some general help in a comment
- Update jQuery to meet new requirements

@pstadler Please take a look & remind me/you to update gh-pages about
new jQuery version requirements
Fix grammar
Fix label for nickname conflict form
Proposal for issue #202

Enable users of Candy to specify if/what happens with the View
before the connection status changes using an event
per connection status as defined in Strophe.Status.
Merge pull request #213 from candy-chat/feature/202-disconnect-smoothening

Add event to react to connection status updates before Candy.View handles it
Update version - beta3
Update dev deps
Upgrade again :) (dev deps)
Use uglify for concatenating, update CONTRIBUTING

- Uglify for concatenating enables sourcemap support
- Add sourcemaps
- Fix `Candy.Core.log`: Shows now correct line numbers
  - we should test if it works in IE still (@pstadler likes to test?)
- Remove grunt-contrib-concat
- Update CONTRIBUTING.md with vagrant install
  - FIXME: Make this easier
Merge dev