Add filter to committee membership admin for active memberships

Ghost User
2018-06-13T20:53:08+02:00

Closes #640

### Short description

Added a new filter for active committee memberships

### Steps to use this feature

1. Create a few active and inactive committee memberships.
2. Go to the admin, and select committee memberships.
3. C...

Closes #640 (closed)

Short description

Added a new filter for active committee memberships

Steps to use this feature

1. Create a few active and inactive committee memberships.

2. Go to the admin, and select committee memberships.

3. Click on the new filters.