fix trailing whitespace
add matplotlib to sentence about packages

In general, when people speak about scientific Python, the mention the trinity
of Numpy, Scipy and Matplotlib.
move the Matplotlib section up

If the introduction mentions Numpy, Scipy and then Matplotlib -- they should
appear in that order in the 'Libraries' section.
fix capitalization
limit line length to 80
insert whitespace after headings for source coherence
grammar and wording tweaks for the scipy description
collect all Python distributions under 'Resources'

Also add a short section introduction about the purpose of this section.
fix name of the EPD
add Anaconda
mention the Python Scientific Lecture Notes
Merge pull request #246 from esc/refactor/scenarios/scientific

Refactor/scenarios/scientific