fix version
argparse finished
write a document about japanese encodings problem
fix japanese_encodings_problem.rst format
fix grammer mistakes in .rst
add -o option; little fixes; add vim_encoding.rst
Merge branch 'master' of github.com:reorx/pyconv

* 'master' of github.com:reorx/pyconv:
  fix grammer mistakes in .rst
  fix japanese_encodings_problem.rst format
  write a document about japanese encodings problem
move vim_encoding.rst to the right place