Fixed possible uncaught exception in Email::send() & Email::batchSend()
Fixed possible uncaught exception in Email::send() & Email::batchSend()

These 2 methods did not catch Swift_TransportException that is throw upon
invalid credentials when connecting to the transport. These are now caught and
thrown as Email_Exception with the same message.

jinshana/tangocms,jinshana/tangocms,jinshana/tangocms,jinshana/tangocms