Jasmine test task won't run during build

Looks like there's a reference to `options` here which isn't defined:

https://github.com/HubSpot/grunt-asset-bender/blob/master/tasks/bender_run_jasmine_tests.coffee#L36

Maybe this was supposed to be defined as something else? I hadn't noticed it before because it only fails here if there are actually Jasmine tests defined.

Thanks @timmfin :)