* Refactoring servers to support custom workers and graceful shutdown.
* Refactoring workers to support custom mailers.
* Refactoring mailer to be an interface, with proper instances instead of a single global instance
* Cleaning up a few things. Locking maillogs for campaigns set to launch immediately to prevent a race condition.
* Cleaning up API middleware to be simpler
* Moving template parameters to separate struct
* Changed LoadConfig to return config object
* Cleaned up some error handling, removing uninitialized global error in models package
* Changed static file serving to use the unindexed package
Fixed a bug when marking the capture password, saving and unmarking the capture password, the attribute does not comeback and the password will never be captured again for this template.
More cleanup - changing *all* API errors to be returned via JSON
Fixed bug where /api/pages/ was not csrf exempt
Changed db column/table names to be more user friendly in the case of acronyms (Id, SMTP, etc.)
Additional cleanup, documentation
Changed return values for /api/templates and /api/pages to return empty array [] if no results (like /api/campaigns was already doing)
