Deleting the job search criteria object

The client's `search` method incorrectly made it seem like you could pass the criteria in to configure your search. This is incorrect! I have removed it since it didn't work previously.

Now all you can do is pass in an argument hash. Here's an example: 
```ruby
[13] pry(main)> Cb.job.search({:location => 'atlanta, ga'})
=> [#<Cb::Models::Job:0x007f93931e2fc0
.....
```

:bear::rocket: