Merge branch 'dev'

* dev:
  add changes for v0.4.0
  CURD.py is `Tiny Python ORM for MySQL`
  ready for 0.4
  docstring typofix
  pass tests
  more docstrings
  add docs for 4 query
  rewrite curd.py typo
  typofixed;
Ability to custom user-defined table_name of Model