Add option to $http for bypassing the processing of request data.

Fixes #121
Add resourceConfigOverrides parameter to $post/$put/$patch.

resourceConfigOverrides is passed from $post/$put/$patch to $http. This
gives $post/$put/$patch the same flexibility as $http.
Merge pull request #123 from mayhewluke/skip-request-processing

Add option to $http for bypassing the processing of request data.