Advanced with StylesActivity base functionality:
 - Added a MultipartPostRequest helper class to handle uploading the Style's images.
 - Created an API function to handle creating a new Style after a picture has been selected.
  - Created a function to handle uploading the Style's images after the Style has been created.

 Next:
   - Going to create a fragment for the new Style creation UI (showing selected image(s) and allowing to add a title)