* Removing all the "#!/usr/bin/env python" lines, they do not need for python3, solving issue number: #19.
* Restored all the shebangs in the tools and tests folders (because they are real executables) but used "#!/usr/bin/env python" instead of "#!/usr/bin/python" as this blog points out: https://www.peterbe.com/plog/importance-of-env
Removed also the shebang from pdfminer/psparser.py file.
Pieter Marsman
Serj Sintsov
Antonio Ercole De Luca
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