Renamed from saml-idp-zendesk to ruby-saml-idp-zendesk

Since this gem is a plugin for ruby-saml-idp indicate that by having the
gem name just append the -zendesk. This pulls over the entire
implementation from the other repository because it's easier to create a
new gem than it is to rename an existing one.
Bump version from 0.0.1 to 0.1.0

It makes no sense to start a project as a patch version number. The
project is not a bug fix of nothing (pet peeve).