draft for social integration
use import from guava
rename UserManager -> SocialUserManager
default resial-id for vote
replace deprecated imports
introduce GaeUsersConnectionRepository
introduce <hni:gae-connection-repository/>
fix init for connectionFactoryLocator
implemented GaeDatastoreSocialConnectionManager. closes #4
social signin integration. closes #2
Merge pull request #5 from halkneistiyor/social-integration

Social integration