dev branch
Merge branch 'dev'

Conflicts:
	virgo.py
Merge branch 'dev'

* dev:
  exmaple:joinmodel
  sample code
  example models
  example
Merge branch 'dev'

* dev:
  move doc/ todo out of this dev branch
  todo
  readme
Merge branch 'dev'

* dev:
  add travis.yml
Merge branch 'dev'

* dev:
  fix travis
Merge branch 'dev'

* dev:
  fix the next time ->->
  fix travis
  mysql tests with blank passwd as default
Merge branch 'dev'

* dev:
  add virgo to sys.path.fix one SQL
  run tests without installing virgo
Merge branch 'dev'

* dev:
  test connection if working in each conn
Merge branch 'dev'

* dev:
  fix per commit
Merge branch 'dev'

* dev:
  fix buf
conn.ping