fix(remainingRequest): resolve issue when multiple variables are exposed for the same request. (#30)

The previous commit for more consistent hashes naively overwrote the
entire request, assuming there weren't additional loaders to be run
against the file.  This modifies the changes to the request to only change
the path to the imported file rather than changing the entire
remainingRequest.

Author: gdborton

index.js

@@ -26,7 +26,10 @@ module.exports.pitch = function(remainingRequest) {
 	// Change the request from an /abolute/path.js to a relative ./path.js
 	// This prevents [chunkhash] values from changing when running webpack
 	// builds in different directories.
-	var newRequestPath = "." + path.sep + path.basename(remainingRequest);
+	const newRequestPath = remainingRequest.replace(
+		this.resourcePath,
+		'.' + path.sep + path.relative(this.context, this.resourcePath)
+	);
 	this.cacheable && this.cacheable();
 	if(!this.query) throw new Error("query parameter is missing");
 	return accesorString(this.query.substr(1)) + " = " +