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"