Removed form validation (as telephone) to allow it to be set to AlphaNumeric

If you get Clickatell to agree an AlphaNumeric CallerID you need to be able to set it.
Merge pull request #3 from awestrope/FromValidation

Removed form validation (as telephone) to allow it to be set to AlphaNum...
Merge pull request #1 from arcturial/master

Remove validation on "from" to allow alpha numeric characters.