Refs #2061, 2063: export Pipeline as well.

lib/Aggregator.js

@@ -22,14 +22,11 @@ var Aggregator = module.exports = (function(){
 		return result.result;
 	};
 
-	var accumulators = require("./pipeline/accumulators"),
-		documentSources = require("./pipeline/documentSources"),
-		expressions = require("./pipeline/expressions");
-
 	//Expose these so that mungedb-aggregate can be extended.
-	klass.accumulators = accumulators;
-	klass.documentSources = documentSources;
-	klass.expressions = expressions;
+	klass.pipeline = require("./pipeline/Pipeline");
+	klass.accumulators = require("./pipeline/accumulators");
+	klass.documentSources = require("./pipeline/documentSources");
+	klass.expressions = require("./pipeline/expressions");
 
 	return klass;
 })();