Make click button less ambiguous, use new RSpec expectation syntax,

and Ruby 1.9 hash syntax.
Merge pull request #595 from JuanitoFatas/profile-spec

Make click button less ambiguous, use new RSpec expectation syntax,
export orders to xls format.
use axlsx_rails gem.
add controller test.
remove mime types.
revert routes change.
Merge pull request #596 from saberma/saberma-feature/export-orders-to-xls-format

导出xls格式的签到表