Hide status and sum for communities with no payments
Rename header "Free conversation" -> "Conversation"
Merge pull request #542 from sharetribe/trans-ui-mods

Transaction UI clarifications
Update conversation when participation is updated

In order to invalidate cache key in global header.
Merge pull request #543 from sharetribe/fix-header-caching

Update conversation when participation is updated
Rename integration features to separate payment gateways
Outline for paypal integration feature.
Move admin integrations to partials.