Merge pull request #183 from dionyziz/pep8

pep8
combine pip packages into one-line in Vagrant; update Dockerfile for new dependencies and dependency cleanup
Remove pyelliptic which is a pip package
Remove ident server, as it is unused
Merge pull request #188 from dionyziz/ident_server

Remove ident server, as it is unused
cleaning up imports
Close sockets after messages sent
Merge branch 'master' of https://github.com/OpenBazaar/OpenBazaar
Fix parameter in stream close
Check for contacts existing and update if stale
Refactor socket creation/cleanup
Check for empty values in contracts for item_price/shipping_address
Remove redundant socket creation. DRY^2
Connect misplaced in init
Update contact on OK reception
Reusing sockets on an object causing communication issues
Add no linger to stream close
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Merge pull request #187 from dionyziz/pyelliptic

Remove pyelliptic from OpenBazaar, as it is a separately maintained pip package
Deduce short list