Interpreted mode is faster

That is, faster to start, but slower processing speed.
On the command-line, I think the former is more important.
* Add docs on json parsing
* Add float type hint
* Simplify output types
Motivating examples

People won't take the time to read and understand each example.
You have to describe each example and explain why it's great.
Merge branch 'master' into gelisam/master

Conflicts:
	README.md
Merge pull request #3 from gelisam/interpret

Interpreted mode is faster
document single value output
Merge branch 'gelisam-doc'
merge json docs and add cheeseburgers
Update README.md
fix backslash escaping in JSON keys
ugh read before push
rename witnesses to i,f,s
Read tab-separated input, steps towards #5

The input is still always an array, but it can now be an array of tuples
instead of an array of ByteStrings.