Refactored settings a bit.
Refactored settings a bit.

* Removed warnings of old settings format.
* Added ENV setting TRANSMOGRIFY_SETTINGS to specify a python file to import with all settings
* Existing ENV settings can still override the SETTINGS specified in that file

callowayproject/Transmogrify,callowayproject/Transmogrify,callowayproject/Transmogrify,callowayproject/Transmogrify