CRM-11958 - hook_civicrm_alterMailer - Cleanup hook definition

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* CRM-11958: New hook implementation for altering outgoing mail configuration
  http://issues.civicrm.org/jira/browse/CRM-11958
CRM-11958 - hook_civicrm_alterMailer - Cleanup comments/formatting

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* CRM-11958: New hook implementation for altering outgoing mail configuration
  http://issues.civicrm.org/jira/browse/CRM-11958
Merge pull request #1607 from totten/master-mailer-hook-cleanup

CRM-11958 - Cleanup