Merge pull request #1 from liatetskaya/YL1

Yl1
Merge pull request #2 from liatetskaya/YL1

fixed login
Merge pull request #3 from liatetskaya/YL1

fixed login
Merge pull request #4 from liatetskaya/YL1

added destroy method for checkins
hello
Facebook OAuth authentication
Require authentication
Profiles, not complete
Merge branch 'master' into YL1
Merged with the master