Updated test case to not depend on the response data.
Added logic for defining a module to load via AMD.
Removed unused dependency.
Fixed AMD module definition. request.js and querystring.js only load for Node.js.
Closes #23. Added AMD module definition.

This feature makes possible to import stardog.js via the AMD (Asynchronous
Module Definition) without having to declare the `exports` variable.

Merge branch 'feature/amd/23' into develop