place tickets spec inside Tickets' containing module

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
move login ticket generation to a module method

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
move TGT generation to module method

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
move Service Ticket generation to module method

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
move unimplemented proxy ticket generation to a module method

Signed-off-by: Tyler Pickett <t.pickett66@gmail.com>
Use module method in validations spec for ticket generation
Merge pull request #14 from rubycas/ticket-spec

Ticket improvements