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.
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.
Added a link to the python tutor for explaining the stack in a more dynamic fashion
removed nested function calling, IMHO this adds too much information to the basics
changes in text to separate a bit the idea of function composition from following the stack in a more complex example
removed in-place operators - never used in the lesson! is it really necessary?
Solve typos in functions and loop notebooks.
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.
removed stray non-printing unicode characters