All bits working

In this pull request we have 2 new features added (creating a service and updating it).

There is also a major change on the project structure in order to make it simpler.

We now have 4 different python classes on the src directory:
s3_download.py: downloads from S3
create_service.py: creates service and tiules
update files.py: removes existing filegeodatabase and creates a new updated one
regenerate_tiles.py: creates tiles after updating file geodatabase

Now it is only missing a new class that runs all the classes every month