Add docs for validator.validate*() methods
Conditionally include a 'guid' property in info returned by validator.

The only situation this doesn't work for is when a raw 0.5.0-style
assertion object is passed into the validator: since there's no way
to know the URL at which the object is hosted, there's no way to
provide a GUID.
Merge pull request #12 from toolness/include-guid-in-info-3

Conditionally include a 'guid' property in info returned by validator.
Got rid of Makefile, made 'npm test' work on Windows.

Makefiles aren't that great for new contributors because on a Mac
they require installing the XCode Tools, and they're yet another thing
to install on Windows.
Merge pull request #14 from toolness/master

Got rid of Makefile, made 'npm test' work on Windows.
Merge branch 'master' into does-recipient-match

Conflicts:
	index.js