messages belongs to an instance
it adds Instance matching popit instance and connect person and messages within that instance
Merge pull request #14 from ciudadanointeligente/project_backbone

Project backbone. close #8
Adding MessageOutbox and creating a message with several contacts
Merge pull request #15 from ciudadanointeligente/project_backbone

Adding backbone
Merge pull request #17 from ciudadanointeligente/dev

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