Refs #8 - Convert request body data to URL parameters for GET requests.

Port toQuery from underscore-contrib:util:strings.
Add missing semicolon.
Refs #8 - Add updated version of underscore.js to devDependencies.

Jest only includes underscore 1.2.4 currently, which is insufficient to test the new module.
Refs #8 - Test HttpGateway::_toQuery.
Refs #8 - Fix alignment.
Merge pull request #8 from synapsestudios/feature/8-get-param-support

Create GET params from Request Body Data for GET Requests