Improve documentation of Crepe::API#version

Include mention of the default version, as well as the expected format
of a vendor string for header-based versioning.

Signed-off-by: David Celis <me@davidcel.is>
Merge pull request #36 from davidcelis/version-docs

Improve documentation of Crepe::API#version
More documentation

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Update development environment to include Pry

Helpful for debugging!

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Happy new year

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Update links to use org

Signed-off-by: Stephen Celis <stephen@stephencelis.com>