Support JASIG style extra attributes

Upgrading nokogiri dependency to ~> 1.6

Fix typo that caused CAS server port to be ignored

Change CAS spec a bit so that it exercises that
part of the configuration

For instance: https://mycompany.com/stuff/cas

The `url` is then automatically parsed out into the required `host`, `port`, and `ssl` properties.

This reverts commit 4fee900d.

Can't have Travis test 1.9.2 if we are declaring 1.9.3...

Revert "Revert "Updated .rvmrc file to use Ruby 1.9.3""

This reverts commit 053db9d4.

This reverts commit 6eff62b6.

Can't have Travis test 1.9.2 if we are declaring 1.9.3...

I've been using this in production long enough without issue that it is time to declare 1.0

If this is needed, I'll gladly accept a Pull Request.