First cromshell release!

This is the first labelled release of cromshell.

It includes some big changes from previous version.

1. The cromwell script has been renamed to cromshell. This allows both cromshell and the actual cromwell tools to be installed together and not conflict.
2. There's a new notify command which allows you to receive email when your job is complete. Very useful!
3. The script has been totally refactored to support better error messages and status codes.