Merge branch 'dev'

* dev:
  realease v0.4.1
  mv updated
  mv english version docs to docs/en
  documentation for v0.4.1
  release v0.4.1
  pep8 fixing, actually not all lines are pep8: width<79
  tests for table_name
  changes for 0.4.1
  table_name default be: '_' joined
fix typos in quickstart
start zh docs
add docs/zh/_build to ignore list