Make findQuery actually use params

The current `_ajax` function on the RESTAdapter doesn't use
passed-in params if the request is not a GET.

This pull request uses JQuerys `param` function to urlencode
the params object (in the case of a GET request). For other
HTTP verbs, the behavior stays the same.
Merge pull request #55 from satchmorun/fix-for-findQuery

Make findQuery actually use params