Only renew membership when membership has a configured status.

[jaapjansma]

In issue #18 the functionality to renew a membership upon completing a contribution is added. However when a new membership is created with a pending contribution the membership has status pending. As soon as the membership is paid CiviCRM core sets the status of the membership to new. With the functionality in #18 enabled the membership is renewed immediatly.

Proposal is to add a configuration so that renewal only takes places when the membership has a certain status (e.g. Active).

[jaapjansma]

After investigating and testing I discovered a CiviCRM core bug. When CiviCRM is not in English then the membership status cron job processes pending memberships to new, even if a contribution is pending.

[jaapjansma]

In the master branch of civicrm core it looks like this issue is solved. I expect that with civicrm 5.7.x this issue will be solved.