Refactored code
Removed /libs folder (#17)

Removed all SDKs from the /libs folder and added how to install them in
the documentation.
Reorganized files (#11)

Reorganized files in folders (models, wrappers, database) and fixed
include issues between them.
The spp structure should now be clearer :)
Added Facebook wrapper (#20)

Added a class that conveniently wraps around Facebook API.
Removed .DS_Store
Merge pull request #22 from linkyndy/code-refactoring

Code refactoring