implement service url cleaner
implement Util.build_ticketed_url function

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
gracefully handle blank url's

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
remove some mocked calls

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
Conflicts:
	lib/rubycas-server-core/credential_requester.rb
	spec/rubycas-server-core/credential_requester_spec.rb