Merge branch 'feature/mongo_2.6.5_expressions_SetUnion' of https://github.com/RiveraGroup/mungedb-aggregate into feature/mongo_2.6.5_expressions_SetUnion

lib/pipeline/expressions/SetUnionExpression.js

@@ -10,7 +10,7 @@
  **/
 
 var SetUnionExpression = module.exports = function SetUnionExpression() {
-	if(arguments.length != 0) throw new Error("SetUnionExpression constructor takes no args");
+	if(arguments.length !== 0) throw new Error("SetUnionExpression constructor takes no args");
 	base.call(this);
 }, klass = SetUnionExpression, base = require("./VariadicExpressionT")(SetUnionExpression), proto = klass.prototype = Object.create(base.prototype, {constructor:{value:klass}});