Add /jobs/ to query_methods

[DschingisKahn]

Pretty simple to add query methods for jobs. Just a copy of the methods for companies (and a bit less in the company_path method). Not at my Mac to do a pull request right now.

(How do I make this a feature request?!)

[hexgnu]

I've got a big backlog to go through still. Eventually would love to have 100% of the API covered :) I'll tag it as a feature though. A pull request would be awesome.

[hexgnu]

@antek-drzewiecki was kind enough to submit a pull request on this so we got it covered!