Adding command line options

[jtyr]

This patch is adding support for command line options which can be used to specify the WAV and keyboard file. It also fixes some warnings from scipy module and improves the code formatting to be PEP8 compliant.

[Zulko]

Thanks for the commit. I have a few objections:

• I really need some of the lines that you erased in the gitignore. It's a standardized file that covers a lot of different workflows, I am ok to add new lines in the file but I'd prefer if you didn't erase the already existing lines.
• You made the whole script Python3-incompatible by adding python2 at the beginning and removing the parenthesis around print statements, that's not a good thing.
• What do you think about using a more modern module like docopt for argument parsing ?

[jtyr]

Thanks for your comments. The first two bullet points are fixed in the last commit. Regarding the docopt, I would prefer to stick with argparse as it's available in Python 2 and 3 by default. Please review it.

[Zulko]

Ok, thanks !