First draft of second lecture of Intermediate Python

Focuses on modularization and documentation by building an
example that analyzes and plots data across a number of files.
Add discussion of how to rerun all cells in ipynb
Use 'attributes' instead of 'member variables'
Be more precise about what documentation generators do
Allow creation of multiple example data files for Inter Python

Generalizes the script for creating data files to allow for the
easy generation of larger numbers of data files.
Adding more data files for the Intermediate Python lectures
Updating modulariation/docs lecture for new datasets

1. Updating the data generation script to make additional datasets
   changed the example data used in this lecture and the output
   related to glob.
2. Includes a naming convention change in prepartion for the third
   lecture (in the works)
Merge remote-tracking branch inter-python-2

'ethanwhite/inter-python-2' into erdc-gh-pages
update links to content
Merge pull request #2 from geocarpentry/gh-pages-development

Switch from gh-pages to development versions of shell and python materials