Adding a simple Python-as-calculator exercise.
Merge remote-tracking branch 'jiffyclub/python-calculator'

* jiffyclub/python-calculator:
  Adding a simple Python-as-calculator exercise.
shell/Readme.md: Fix 'swsc' -> 'swc' typo
Merge pull request #25 from wking/swsc-typo

shell/Readme.md: Fix 'swsc' -> 'swc' typo
Update shell/Readme.md

Fix typo and some missing words.
Merge pull request #27 from douglatornell/patch-1

Fix typo and add some missing words in shell/Readme.md
Update shell/Readme.md

Improve wording in `cp` file backup example.
Update shell/Readme.md

Fix markup to highlight `find` command.
Merge pull request #28 from douglatornell/patch-2

Update shell/Readme.md
Merge pull request #29 from douglatornell/patch-3

Update shell/Readme.md
get-my-ip.py: Add a script for getting your public IP address

This will help students connect to each other on the LAN during class.
Note that if you ping a host across a NAT, you'll get your IP inside
the NAT, not the NAT's IP.
get-my-ip.py: Python 2.x sockets can't be used in 'with' statements

They don't have __exit__.  Use an explicit try/except block to be
compatible with both 2.x and 3.x.
make: Remove this whole section

We don't teach compiled languages, so the need to teach build systems
is not very strong.  I also use Make to help analyze my data, but
nobody has had the time or inclination to teach Make in a boot camp
yet (as far as I know).  Let's just remove this whole section.
Merge pull request #33 from wking/no-more-make

make: Remove this whole section
Adding README and instructor notes for new Python with ipythonblocks section.

This section will cover teaching basic Python via ipythonblocks.
Adding ipythonblocks module at version 1.5.
Adding material related to introducing students to RGB colors.
Adding material for "Playing with Blocks" section.

This section covers introductory Python such as indexing, variables,
for-loops, if-statements, and slicing.
Adding material for the "Building Blocks" section.

This section covers reading files and working with lists and strings.
Instructor notes for teaching git via collaboration on GitHub.

The focus of the lesson is to have students contribute to a repo on GitHub in
which we are building up a list of the things they are most interested in
learning at the boot camp. Requires everyone have a good internet connection
and that at least some of the participants sign up for GitHub.