Fix contact form

[GUI]

Looks like our contact form at https://api.data.gov/contact/ became broken after the larger API Umbrella v0.14 upgrade: #382

I think the issue is just some differences in CSRF handling on this API endpoint due to the Rails 4 upgrade behind the scenes.

[GUI]

Should be fixed. It was actually related to serialization changes in how ActiveJob/delayed_job handles things in Rails 4 (see NREL/api-umbrella@96862e0).