Importing SQL cheat sheet
Importing Git lessons - but getting a weird build error (and  is rendered as an en-dash)
Importing legacy shell lesson
Removing summary section from lesson (was supposed to be in separate file)
Importing invasion percolation example: getting Jekyll/Maruku build errors, but no line numbers to help fix them.
Merge pull request #2 from gvwilson/gh-pages

Importing lesson material.