Update README.md
Merge pull request #4 from shiva-spampot/development

Development
fixed parsing zero size file
Merge branch 'master' of https://github.com/shiva-spampot/shiva
fixed parsing null spam file
Update README.md
Updated install script to fetch correct version of Python libs and added check for more dependencies.
Merge pull request #6 from shiva-spampot/master

Pull request to bring 'development' in sync with 'master'.