Another fix for undefined rawValue in extractParam

The previous merge request failed 2 tests #13

This merge request includes the patch and updates the tests.

Orignal description :

rawValue can be undefined because of the case of the query property.

This merge request adds toLowerCase to nameInQuery and paramName to fix this behavior.

edit

A test has been added to check that the properties are case insensitive. : extractParams / case insensitive properties