set mongoid logger level to info for test env
adding timecop to fake time
prepare paid subscription feature
-  creating subscription resource
-  adding utility methods to user
-  prevent full access to requirements if free trial has ended
-  basic credit card integration specs
conditional logic for requirements page view
-  user on free trial period sees a remaining days message
-  deny seeing requirements/proofs for users:
    -  having a deactivated subscription
    -  having with an expired free trial period
-  appropriate messages for the former cases
-  utility methods on user model
adding stripe gem and config
user can pay with stripe
adding stripe config to application.example.yml