Transforms: Support babel6

A change in the output from Babel 6 emits default transforms as
`module.default` rather than `module["default"]`. This changes the shape
of the node that globalize-compiler examines.

Closes #12

Author: alunny

Diff for: lib/extract-transforms/babel-globalize2-default-into-globalize.js

@@ -2,9 +2,14 @@ var esprima = require( "esprima" );
 
 var Syntax = esprima.Syntax;
 
+function isDefaultProperty(prop) {
+	return (prop.type === Syntax.Literal && prop.value === "default") ||
+		(prop.type === Syntax.Identifier && prop.name === "default");
+}
+
 /**
- * Transform `_globalize2["default"].<fn>` (commonly generated by babel when transpiling ES6) into
- * `Globalize.<fn>`.
+ * Transform `_globalize2["default"].<fn>` or `_globalize2.default.<fn>`
+ * (commonly generated by babel when transpiling ES6) into `Globalize.<fn>`.
  */
 module.exports = {
 	test: function( node ) {
@@ -13,8 +18,7 @@ module.exports = {
 			node.callee.object.type === Syntax.MemberExpression &&
 			node.callee.object.object.type === Syntax.Identifier &&
 			node.callee.object.object.name === "_globalize2" &&
-			node.callee.object.property.type === Syntax.Literal &&
-			node.callee.object.property.value === "default";
+			isDefaultProperty(node.callee.object.property);
 	},
 
 	transform: function( node ) {