add guard zeus gem.
create ticket.
edit ticket.
destroy ticket.
add ticket feature test.
add ticket require invoice and event tickets quantity.
add test for ticket destroy and update.
update ticket feature test.
remove test for mysql, sqlite and ruby 1.9.3
Merge pull request #452 from saberma/saberma-feature/450-create-tickets

活动管理员新增门票 #450