first draft of SSH keys for GitHub lesson
remove OSX specific pbcopy, remove passphrase material, explain random art image
removed mention of for loop

Following up 2014-06-24-wise-penn/#2 It had been commented out here, and to minimise confusion I've deleted it completely. Loops come in lesson three (this is lesson one), so I think it's safe to exclude it from here.
removed mention of for loop

making the md file consistent with the Rmd file
Merge pull request #547 from benmarwick/remove-mention-of-loop-in-novice/r

removed mention of for loop in lesson one
Importing old lesson from Version 4 on regular expressions as a starting point for new work.
Merge pull request #470 from brenna/github-ssh-lesson

setting up SSH keys for GitHub lesson
Adding links to reference material on appropriate pages
Merge pull request #560 from gvwilson/adding-links-to-reference-guides

Adding links to reference material on appropriate pages
Add CSS for printing

The CSS was add at our main CSS and remove from printing:

- Logo at header
- GitHub ribbon
- Footnote

Close #561.
convert START-HERE.html to START-HERE.md

Markdown conversion using PANDOC
Shrink the font size for print version
Split markdown out into separate files
Delete START-HERE files
Change text tables to diagrams, add png files
update tabs and spaces description
typo
Merge pull request #564 from danmaclean/creating-lesson-on-regular-expressions

Creating lesson on regular expressions
Merge pull request #562 from r-gaia-cs/media-print

Add CSS for printing
Updating README with description of Windows installer