Get FILES method to be modified, prepared the stubs.
Post SHARES method ready for test.
Merge branch 'share_devel' of github.com:generale84/share-system-team2 into share_devel

Conflicts:
	server/server.py
GET method ond files resource modified to allow clients to download shared files.

_is_shared_with_me() function implemented to check if the file requested is shared before downloading it.