Uploaded lesson on reading and writing .csv, including exploration of arguments in the functions
Added edited lessons on HDF5 after reviewer comments
Updates to lesson and associated files
working on a python pitch
ipython image
python pitch, cribbed from sritchie73's R motivational slides
typos
re-organized alternatives
put image in the correct place
incorporated comments from pull request (finally)
fixed some sloppy formatting
changed R content
updated PyPI numbers
Minor corrections to python-pitch.html

- Cut some text from "Why Python and Not..." slide,
  as it was too large for the slide
- Removed superfluous ">" which was showing up on all slides
- Fixed IPython notebook slide; both image and <ul> show up
Merge branch 'python-motivation'

* python-motivation:
  Minor corrections to python-pitch.html
  updated PyPI numbers
  changed R content
  fixed some sloppy formatting
  incorporated comments from pull request (finally)
  put image in the correct place
  re-organized alternatives
  typos
  python pitch, cribbed from sritchie73's R motivational slides
  ipython image
  working on a python pitch
Updated glossary for Intermediate Make lesson
adding md file
standardized Rmd header information
Merge pull request #798 from emhart/master

Added edited lessons on HDF5 after reviewer comments
Change file extension from rmd -> Rmd.