Solve issue #44

The 'box' class overflow the window width for some screen size.
This patch fix it using CSS media query.
Fix for issue #44 with large font size

When using large font it will overflow the width so I add
max-width in the css.
Replace Python with Shell

In the box "Text vs. Whatever" it say Python when should say
Shell.

I move this box two paragraphs up to be closer of the lesson
part about writing the file 'middle.sh'.
Add cloud storage "info".

Some folks are using cloud storage with file synchronization.
Add editor for GNU/Linux

AFAIK textedit isn't include in all GNU/Linux distribution.
I add gedit as the GNU/Linux text editor.

I change the order of the configure commands to be the same of
present in the text.
Replace "Shell" by "shell"

As point out by @ahmadia we don't use "shell" capitalized (see the
Wikipedia entry: http://en.wikipedia.org/wiki/Shell_(computing)).
Cite shell parameter expansion

This is part of Issue #54.

In this commit we mention the shell parameter expansion to make
easy to students go deep if they need.

We also add a note about use ${some-var} instead of $some-var.
Example find and replace in bash variable

This is part of Issue #54.

In this commit we add one example of find and replace some string
in the value of a bash variable using shell parameter expansion.
Added objectives to swc-python files-list ipython notebook
Add key points to swc-python file-lists ipython notebook
Added figures for lists, organized list section.
Adding figures for list references.
Fixed typos suggested by @ahmadia.
Improves base on comments about editor for git

I set GNU nano as the recommended editor and change the position
of some information to not duplicate it.
Some changes about editor for git

Make changes suggest by @ahmadia.
Fix some typos

Thanks to @ahmadia and @ethanwhite for the review.
Add field names to the database tables

Helps with understanding which data is retrieved by the queries
Add image to illustrate join
Changes after field testing this summer
add TOC for README.md