Added Create User Screen

Hi Jeff, Bharat,
FYI
- Added create user screen; since we are using parse, need username,
email-id and even a password. (Hated it when user needs to do massive
effort; we can discuss workarounds later)
- Created error alert, in case user puts invalid info during user
creation.

- FYI, I had included lot of notification stuff to dynamically enable
buttons… but got errors and Xcode debugger isn’t always intuitive, so
rolled it back and recreated couple of files and kept it simple.

Jeff, if you want, please feel free to take a stab at create broadcast.
I may not be able to look at it till late tomorrow evening.  Kudos to
you for some inspiring work!

cheers
Simer
No change, but need to sync local
Revert "No change, but need to sync local"

This reverts commit 0d92ab24381a05c2e9a17cece8b5bc534f06c4d3.
Deleted duplicate Name View Controller file...
Create broadcast screen