Fix #9 specify version and add optional requirements
Read requirements.txt for setup install_requires, keywords and classifiers added for PyPi
Release v1.0.1
Fix #13 system path separator problem

Use os.sep instead of '/' for Unix-like and Windows
Release v1.0.2
Fix #14 Chinese filename problem
Release v1.0.3
Merge remote-tracking branch 'track/master' into dev
Use with statement to ensure the file is closed by Python
Pass PEP8 code style check.(P.S. Some of the E501 line too long warning remain unfixed.)
Merge branch 'messense-dev' into dev
Remove empty lines in install_requires
Merge branch 'messense-dev' into dev
Update url
Update code style