Add support for isActive on resources

[ThomasKranitsas]

1. Update the challenge resource processor to listen for challenge updated and update the resource to set an active flag to the same value as the challenge active status. Basically, if a challenge is active, the resource is active..
2. Add to GET /resources the ability to filter by Active (null (no filter - both states), false, true)
3. Add to the query on Resources to listChallengesByMember to to filter by Active, (null (no filter - both states), false, true)
4. Create a migration in resources to update that resource active flag based on challenge id

cc @rootelement