ADD: IPython notebook with a tutorial (mostly the same as ex1.py).
ENH: README.md adjustments.
Update README.md

ENH: Added instructions on how to run the IPython notebook.
ENH: Typo fix.
Update README.md

Removed whitespaces at the end of README.md
Merge pull request #56 from rkwitt/rk-pyrpca-ipython-notebook

Merge pull-request, since functionality did not change - only documtatation.