Initializing template for Software Carpentry bootcamp home pages.
Cleaning up description of how to create bootcamp home page, and bringing files into sync with revised description.
Describing the 'orgs' and 'people' directories.
1.   Renaming the instructors' guide sections to make intention clearer.
2.   Adding `lessons/index.html` to explain what each lesson section is for.
3.   Adding more explanatory notes to `README.md`.
Bringing Makefile into line with Jekyll 1.1.0
Fixing links in index file to lesson material
Removing YAML header lines from README.md
Merging changes to README.md from ec153e80
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.
Explaining invasion percolation in lesson index
Trying to fix formatting errors
Importing sets and dictionaries material
Updating README to reflect actual structure
Renaming shell and git tutorials to allow for others beside them
1. Importing Python debugging tutorial from Anthony and Patrick (via the 'restructured' branch in the old repo).
2. Getting build errors in lessons/python-debugging/tutorial.md, but can't diagnose (no line numbers in error messages when run in Jekyll, and Maruku seems to stumble on Pygments highlighting).