Merge pull request #101 from ciudadanointeligente/api_list_messages

Api list messages
Merge pull request #102 from ciudadanointeligente/api_list_messages

Using popit url of a person to create a message
Merge pull request #105 from ciudadanointeligente/api_list_messages

Removing skipped test and transforming it into issue #104, just to impro...
Adding messages field to the instance api resource
Changing messages key in the writeitmessages api to messages_uri