Clean up login's page.
Add icon's field to group.
Add social network token's item to people model.
Update some constraint from people model
Update people activities model.
Merge branch 'fas3_pingou' of https://github.com/fedora-infra/fas into FAS_3.0

Conflicts:
	fas/models/group.py
	fas/models/people.py
Add groups membership's model.
Update account_activities_log's model.
Updete/Add relationship on models.
Add more details infos to people & groups json's output (including request metadata).
Add model plugins.
Add model account permissions.
Add model licenses & signed licenses.
Add related get's function to provider.
Make project related infos configurable.
Add apikey check from request url.
Add base api key validatoor.
Add perms level to filter people's infos.
Move user naming to 'people' everywhere to keep consistency on 'people' wording.
Add request timestamp into JSON output.
Always return error in JSON output with same format.
Some more pep8 fixes on the people model
Some more pep8 fixes on the group model
Some more pep8 fixes on the license agreement model
Some more pep8 fixes on the models model
Some more pep8 fixes on the provider model