Resume recs addition

this adds the ability to call for resume recs through the api gem.  This requires an OAuth token which is usually generated through Services::OAuth in Consumer domain, but you can do this using any OAuth client including the CB 3scale ruby gem.
I would propose a slightly different classname + namespace, let me know what you think:
```ruby
Cb::Responses::Recommendations
```
Could even go a step further and do this, although I think I remember you said this response can be shared between the different recs type so this might not be necessary:
```ruby
Cb::Responses::Recommendations::ForResume
```