Fix sending emails using the 'name <email>' format
Fix sending emails using the 'name <email>' format

Trying to set the 'From' address as 'name <email>' currently
fails because the logging can't handle array-variables. This
patch serializes the $fromMail variable for the logger which
fixes the issue.

Fixes #23

alexander-schranz/SuluFormBundle,alexander-schranz/SuluFormBundle,sulu/SuluFormBundle,sulu/SuluFormBundle