Merge pull request #119 from RiveraGroup/bugfix/mongo_2.6.5_expressions_missing_variadic_def

EAGLESIX-xxxx Need to add VariadicExpressionT to the index.js file.

lib/pipeline/expressions/index.js

@@ -28,6 +28,7 @@ module.exports = {
 	SubtractExpression: require("./SubtractExpression.js"),
 	ToLowerExpression: require("./ToLowerExpression.js"),
 	ToUpperExpression: require("./ToUpperExpression.js"),
+	VariadicExpressionT: require("./VariadicExpressionT.js"),
 	WeekExpression: require("./WeekExpression.js"),
 	YearExpression: require("./YearExpression.js")
 };