Increasing length of pricing label on event registration

- We're doing this because we have a client who has descriptions within their labels.

- The second solution is to create a "description" field that is included with the labels.  Adding a new field adds more complexity to the module that we could potentially avoid.
Removing redundant (immediate check) in membership model

- This check is unnecessary.  The loop operation does not continue if the list evaluates as (python) False.
Returning back MembershipDefault instance on method calls

- In the MembershipDefault.renew method we sometimes create a new membership instance.  Returning back the instance allows us to continue with the active membership record.
Removing extra group refresh statement.

- This is a duplicate call.  The group refresh method is already called within the MembershipDefault.renew and MembershipDefault.join methods.