Add optional convenience fee to events
Merge pull request #3 from lanceulmer/convenience-fee

Add optional convenience fee to events
Fixed updating event process so it does not change the sale_date time unless set to do so
apply current time to sale_date if immediately is checked. Added check to see if global payment credential exists before presenting buy tickets button on event page
Apply convenience fee during actual payment processing
Merge pull request #4 from lanceulmer/convenience-fee

Apply convenience fee during actual payment processing