Added name to XCVersionGroup

Author: IvanKarpan

lib/pbxProject.js

@@ -520,6 +520,7 @@ pbxProject.prototype.addToXcVersionGroupSection = function(file) {
             isa: 'XCVersionGroup',
             children: file.models.map(function (el) { return el.fileRef; }),
             currentVersion: file.currentModel.fileRef,
+            name: path.basename(file.path),
             path: file.path,
             sourceTree: '"<group>"',
             versionGroupType: 'wrapper.xcdatamodel'

test/dataModelDocument.js

@@ -151,6 +151,7 @@ exports.dataModelDocument = {
         test.equal(xcVersionGroupEntry.isa, 'XCVersionGroup');
         test.equal(xcVersionGroupEntry.children[0], newFile.models[0].fileRef);
         test.equal(xcVersionGroupEntry.currentVersion, newFile.currentModel.fileRef);
+        test.equal(xcVersionGroupEntry.name, path.basename(singleDataModelFilePath));
         test.equal(xcVersionGroupEntry.path, singleDataModelFilePath);
         test.equal(xcVersionGroupEntry.sourceTree, '"<group>"');
         test.equal(xcVersionGroupEntry.versionGroupType, 'wrapper.xcdatamodel');