HTTP endpoint

[liammclennan]

A separate project, depending on PostgresDoc, that exposes PostgresDoc unit of work as an HTTP post. Not restful because I don't want to lose transactionality.

curl -X POST http://domain/ -d '[ 
    { verb: 'insert', type: 'Person', id: 1, entity: { name: 'Bob', age: 93} },
    { verb: 'update', type: 'Person', id: 1, entity: { name: 'Bob', age: 94} }
]'

Combined with #10 and some authentication this is a basic BaaS.