Add package keywords
Refine package classifiers
Update version number
Use file docstring as package long description

This allow to write package description on `pypi` in reST by keep readme in
repository plain text.
Add package overview for `pypi`
Add package download url
Don't split file content by lines
Build wheel as well
Add missed package requirements
Add make command to publish new release on pypi
Construct file path from parts

Make it OS-independent.
Move package requirements into separate directory
Keep repository README simple
Update extension short description
Merge pull request #4 from vitalk/prepare-to-upload-to-pypi

Register package in pypi