CRM-15578 - Extract crmUiId
CRM-15578 - Implement crmUiRichtext; incorporate into crmMailing2 UI.
CRM-15578 - crmMailing2 - Respect $config->replyTo option
Merge pull request #4699 from totten/master-civimail-rte

CRM-15578 - Implement crmUiRichtext. Update crmMailing2 UI.