Create first steps for recurring due date
Create Recurring rent model

* Set up initial recurring rent payments
* Set up cron job to check whose rent is due
  and if so create a rent object for that month.
* I need to test this further and then begin writing
  tests for this.
* I also need to find a way to have rent paid for a certain
  billing period and stop it from being double paid... also
  set the rent status as paid when the renter pays the rent
Add due date and update cron jobs
Fix rake tasks and more

* Fix rake tasks to only create a new rent instance for the
  current rent instance if the current rent for that billing period
  hasn't been created yet
Create first rent when user is created
Update how rent periods show
Create Pay now buttons and more

* Allow users to pay now for new rent model
* Implement simple ajax method to pay now
* On ajax success change dom text to paid
* Fix Landlord dashboard settings
Update Background workers and more

* Create background worker to pay landlord after
  set time and after the rent has been paid by the user
* Refactor application code to be more user friendly
Update user tests
Update billing period
Remove commented out code
Merge pull request #26 from jeffAwesome/recurring-due-date

Recurring due date