Cleaning Up the Send Form

* Added recipient selection
* Added validation
Merge branch 'master' into send-form-update-1

Conflicts:
	application/views/pages/person/edit.php
Refactoring

* Only use try/catch blocks when necessary instead of nesting
everything in one block

* Return early if the SMS provider has not been configured

* Simplified the validation of the selected recipients

* Improved the exception message that is returned when an SMS provider
has not being configured
Merge pull request #19 from ushahidi/send-form-update-1

Send form update 1