Reorganized Atmosphere API URLs for better troposphere integration

* Added new api/urls.py
  * Moved init_files to new URL location /api/v1/init_files/
  * Updated all the resource files of new URL locations
  * Code cleanup in the associated areas
  * Added new api/v1/provider/#/identity/#/machine/#/icon
    * New JPEG and PNG renderers for the image
    * Other image formats will require a new renderer
  * Moved email links to /api/v1/email/.../

	new file:   api/renderers.py
	new file:   api/urls.py