Remove #fff from Job Type

Hey Mike,

Firstly, thanks so much for making this plugin. It's freaking awesome :) I'm testing it out at the moment for a community site we have.

I noticed that the job type on the preview listing was white so you couldn't see it:

![job type white](https://f.cloud.github.com/assets/1377956/629723/856b6016-d16a-11e2-950d-0deb99f74d7f.png)

I've also altered the padding on .job_listing_preview as well so there is 1em around all sides as seen below:

![fix padding](https://f.cloud.github.com/assets/1377956/629722/8532b040-d16a-11e2-9bec-bb506d9eeb0a.png)

Hope that's helpful! Now time to get back to MOAR testing :grinning: