Includes PHPDoc license tag in the file-level block with accompanying copyright notice.
Also added an AUTHORS file on the off chance of outside contributions
Fixed many errors in queries:
- Prepared statement wasn't running at all :)
- Returning feed ID rather than subscription ID
- latestEdition wasn't matching
- Test files now consist entirely of traits:
- General setup trait mocking User class and cleaning up
- Driver trait to set up the database connection
- Series trait containing tests for the series, independent of driver used