Updated UBER spec doc

I updated the spec docs for UBER ("Uniform Basis for Exchanging
Representations") and posted the changes in a branch on github:
https://rawgithub.com/mamund/media-types/spec-fixes/uber-hypermedia.html

This covers most of the suggestions I've had to date on cleaning up the
spec and making the JSON variant more canonical.

diff details can be found here:
https://github.com/mamund/media-types/compare/master...spec-fixes

Thanks for the contributions and looking forward to the feedback.

Cheers.

mamund
+1.859.757.1449
skype: mca.amundsen
http://amundsen.com/blog/
http://twitter.com/mamund
https://github.com/mamund
http://linkedin.com/in/mamund