First commit of Season Service code, not completed

This code is not yet finished.
I've got tests written for the main currentLocation public method (message).

But, I've got to
1) using TDD approach, test fetching of Latitude. Need to research how to test Core Location calls.
2) once done, then tidy up and finish implementation of this code.

This code is the start of addressing https://github.com/Ippoippo/Kyou-No-Haiku-for-iPad/issues/1

Signed-off-by: Ippoippo <ippoippo_software@ippoippo.net>