Added the beginning of a regex notebook.
Draft of for loops notebook
Removing enumerate from for loop notebook and adding changing the values in a list
Add nbviewer-dev link to README.md

Added a link to nbviewer-dev view of this repo so people can
easily navigate to rendered versions of the Notebooks.
noble gases not nobel gases
Correcting typo
Clarifying how loops work in Python compared to other languages.

1. Proper description of what Python is doing in the intro
2. Explicit discussion of differences with other languages
Adding a Want To Learn More section with links to Python tutorial
Renaming regex to regex-intro since there will likely be more advanced/more topical notebooks in the future.
Changed the narrative a little to focus on processing just one file. I figure the multi-file discussion can go into another notebook. Wrapped up the discussion of extracting the date string and starting to focus on extracting all the info per line. That will introduce wild cards like * and +, as well as groups and the re.search function.
Maybe finished up intro regex notebook. I concluded with groups and stopped short of introducing re.search and MatchObject. I couldn't think of a good seque and it seemed like there was enough there already.
Added a table of contents to regex intro notebook.
Fixing incomplete sentence in Looping Over Integers section
Adding links to Python docs on for and range
Changed the markdown a little in the TOC to see if nbviewer renders it correctly.
Another try with the markdown in the TOC.
Merge pull request #1 from ethanwhite/forloops

I think this has been sitting here long enough.
Merge pull request #2 from jiffyclub/regex

Regex notebook 1