Add buildbot Makefile for CI.
Add buildbot Makefile for CI.

* Configures Riak with both HTTP and PB, LevelDB backend.
* Runs the 'create_bucket_types' distutils command to create the
  appropriate bucket types.
* Lints using pep8 and pyflakes.
* Runs the entire suite with YZ enabled.

Note this requires basho/basho_buildbot#12.

basho/riak-python-client,basho/riak-python-client,GabrielNicolasAvellaneda/riak-python-client,bmess/riak-python-client,GabrielNicolasAvellaneda/riak-python-client,bmess/riak-python-client,basho/riak-python-client