* Remove testing for rethinkdb, mongodb, and Py3.5
* Add first tests
* Add validation
* Add command to start the ABCI Server
* Reuse existing MongoDB Connection class
* Use DuplicateTransaction
* Test only tendermint
* Update travis scripts
* Fix pep8 errors
* Update Makefile
* implement output.condition.details marshalling and remove signature field
* rename outputs[].condition.details.subfulfillments to subconditions
* simpler threshold depth overlow handling
* pass public_key as kwarg
* change ccv1 condition uri in docs
* import base58 at top in test_transaction
* tx version break step with server version
* fix regular expression for tx version
* restore docstring for Transaction version parameter
* add test for correct transaction version
* Changes to support auth on the infrastructure
* Auth over TLS/SSL support in BigchainDB, MongoDB, Monitoring Agent, Backup Agent
* Update certificates: Different OUs specified now
* Code formatting
- Make flake happy!
* Raise proper authentication failed error
* Documentation changes for auth
* Support auth in k8s deployment
* Commit certs for monitoring and backup agents
* Configuration to allow Cloud Manager Backup Agent to backup data
* Update docs and remove authentication error
- If spent=None return all outputs
- If spent=True return only spent outputs
- If spent=False return only unspent outputs
- Updated documentation
- Add the ability to return only spent outputs in core
- Added and update tests
* Add SSL support for MongoDB connections
* Tests for TLS connectivity and other fixes
* Add test for ssl parameters
* Add test for AuthenticationError
* Cleanup branch
* Split env vars as per @r-marques suggestion
* Remove SSL_ENABLED and use BIGCHAINDB_DATABASE_SSL instead
* Changes as per comments from @r-marques
* Remove redundant tests
* Test for ConfigurationError
