Fix #58 Exception after removing entity.
Merge pull request #57 from LiveMinutes/fix_cursor

Enable self cursor tracking (basics for live toolbar update)
Add Google Group link to README
Issue 59: Allow 'getHtml' (instead of 'export') for exporting entities, since 'export' is a reserved keyword.
Merge branch 'master' of github.com:firebase/firepad
Fix #54.

* Don't apply text attributes to line sentinels.
* Do a better job of deciding what the "current" attributes should be when selection starts or ends on line boundaries.