Modernize codebase

[ElDeveloper]

Add coveralls.
Add flake8/pep8 checks.
Remove __version__,__author__ ... etc strings where possible.
Add BSD license header to all files.
Remove shebang from library files.

I'm tagging this issue as an easy fix, because the changes should be very simple, however it might take a while to do them all.

[ElDeveloper]

• @josenavas will work on sort.py, test_sort.py and test_util.py.
• @mortonjt will work on biplots.py and test_biplots.py
• @ElDeveloper will work on format.py and test_format.py
• @wasade filter.py and test_filter.py

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The following have been unclaimed yet:

• parse.py and test_parse.py
• setup.py

[josenavas]

I will take test_util.py (I do not haver permissions on this repo to modify your comment @ElDeveloper )

[ElDeveloper]

@josenavas, updated, thanks!

[josenavas]

working on setup.py

[josenavas]

And working on the remaining one... parse.py and test_parse.py

[mortonjt]

@wasade , I can take care of pep8ing filter.py and test_filter.py