Removing explicit 'level' keys from Markdown files
*   Getting rid of old cheat sheets
*   Indenting error output cells
*   Removing explicit 'level' keys from Markdown files
*   Storing the generated files so that people who don't use those tools won't have to regenerate them.
*   Modifying .gitignore to reflect this.
*   Updating the Makefile to run Jekyll exactly once.
*   Command to install on the server
*   No longer worrying about making a page of images
*   Better (more guessable) name for the target that builds the website
*   Fixing image paths
*   Fixing up glossary entries
Merge branch 'sticking-with-jekyll' of github.com:gvwilson/bc into sticking-with-jekyll
Modified build to generate Markdown files for IPython Notebooks in the source directories so that the Jekyll build will put all the files in the right places.  (Having a separate CACHED directory is cleaner, but then we have to move or patch files after the fact to make links resolve.)
Adding links to reference material on appropriate pages
Update Markdown from IPython Notebooks

Update Markdown files based on previous commit changes at template.

Built with

    $ python --version
    Python 2.7.7
    $ ipython --version
    2.1.0
Importing files from upstream master
Change some anchors to enable EPUB post processor
Merge remote-tracking branch 'amyrbrown/hg' into hg; re: PR#5.

* amyrbrown/hg:
  Copyedits
  Importing files from upstream master
Split 08 SQL notebook into two sections

The current notebook combined adding and dropping tables and changing
the data in existing tables into one long section. These are logically
separate sets of commands and grouping them together created a bit of a
wall of text.
Update Markdown from IPYNB based on new template
Add Update to SQL lesson on creating and modifying databases

When showing students how to add and remove records it will be natural for
them to ask how to modify an existing record. This demonstrates how to do
this using Update in a few lines.
Instructions for creating the sample database used in SQL lessons.

This replaces #702, which had a lot of other things folded into it - undoubtedly could have cherry-picked the necessary changes, but merging one file seems simpler.  All credit for this work goes to @rkiko and @svaksha.
Add updated markdown version of 08 SQL notebook
convert ipynb table heading to html for consistency
Merge pull request #721 from ethanwhite/sql-create

Add UPDATE to SQL lessons
times for shell, python, git, sql
only keep n,median; remove mean,min,max
        Merge pull request #789 from chendaniely/time-estimates

        times for shell, python, git, sql