Move `fs.readFileSync()` to be inline.

All the vars at the top of the file were getting a little out of control,
this also makes it a little clearer as to where an example file is
located. We will need to be careful to not `fs.readFileSync()` a file
more than once as it will be inline multiple times.
Merge pull request #42 from pieterv/docs-inline-fs-calls

Move `fs.readFileSync()` to be inline.