Auto-Capture Mode

Added Autocapture Mode that does exactly what was asked for in issue/request #14 -- but more polishing could be done

* minimum time elapse for a new note to be created rather than just going back to where you were (the 'oops, I nicked the home button' scenario)
* true cancel functionality in the `newNoteController` (it could get a little annoying to keep having to delete such an auto-created note and have the sync count keep incrementing)

![(screen shot)](https://f.cloud.github.com/assets/2082195/162083/96447e64-77aa-11e2-901f-daf3c16086e5.png)