remove test for mysql, sqlite and ruby 1.9.3
fix deprecates at test cases and seed
Merge pull request #452 from saberma/saberma-feature/450-create-tickets

活动管理员新增门票 #450
Merge pull request #460 from jasl/fix_deprecates

修改了过时的用法
now can use SELENIUM_BROWSER to specify which browser to use, default is firefox
Merge pull request #461 from jasl/imporve-selenium

可以选择capybara使用的浏览器
merge master.