Improve type discussion somewhat

Add some examples to the initial discussion of types.

Also, talking about "fear and loathing" is exactly a good sell for a language intro, so rework that bit.

Also, the concepts of int and float haven't yet been introduced. So explain them a bit. It might be saner to drop the "let's make it a float" part but I didn't do that.
Wordsmith on types
fix spacing, wordsmith
Fix naming and comments sections

Talk a little more about naming variables and context, and on choosing a convention.

Make the voltage comment actually a good comment.
Merge branch '2014-08-04-Davidson' of github.com:njvack/boot-camps into 2014-08-04-Davidson
Merge pull request #57 from njvack/2014-08-04-Davidson

Edits to the Typing section of "Code for People"
Fixed spacing on code for better copying and pasting in ipython
Fix typos and use capitalization consistently
Merge pull request #58 from njvack/fix_typos_and_caps

Fix typos and use capitalization consistently
Remove discussion of `is` in "Write Code for People"

It's rarely-used (I write a lot of python and basically
never use it) and really special-case-y. It's mostly
useful for `if foo is None` but we don't ever cover
`None`, so there's that. And `is` doesn't come up in
any of the rest of the curriculum.

Anyhow, we never cover whitespace in the current
version, so we'll need space from somewhere.
Add PATH modification for our servers...

... otherwise we'll be running an old python.
Format short exercises consistently
moved exercise into discussion of generalizing code and reformatted
Merge pull request #60 from dmnielsen/2014-08-04-Davidson

Fixed spacing on code for better copying and pasting in ipython
Merge pull request #63 from kliph/2014-08-04-Davidson

make sure we move to the simplestats directory to make README.md
Merge pull request #59 from njvack/remove_is_discussion

Remove discussion of `is` in "Write Code for People"
Reorganize "Writing Code for People"

Now it goes:

Variables
Naming Variables
Comments
Data Types
Ints and Floats
Data Operations (really: more ints and floats)
Lists
Assigning Variables to Other Variables
Tuples
Dictionaries
Sets
Conditionals

... which I think flows a lot better
Merge branch '2014-08-04-Davidson' of github.com:njvack/boot-camps into 2014-08-04-Davidson
Revert "Add PATH modification for our servers..."

This reverts commit 7d7a37dd7c8174e188cf032b2cda63d6e0dbebe7.
Revert path editing stuff

we won't need it after all