Numpy

Several changes occured since my last note about installing python scientific environment:

• IPython Notebook was succeeded by Jupyter Notebook
• seaborn package is used for the pretty matplotlib plots
• raw virtualenv was replaced by virtualenvwrapper
• procedure of notebook profiles creation and edition has been changed
• ipython bug about pip in virtualenv is obsolete. But now another workaround is needed for packahes installation
• pip installation from pypa is now one-liner