Added test for completion in namespace imports.

tests/cases/fourslash/completionListInNamespaceImportName01.ts

@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts'/>
+
+// @Filename: m1.ts
+////export var foo: number = 1;
+
+// @Filename: m2.ts
+////import * as /**/ from "m1"
+
+goTo.marker();
+verify.completionListIsEmpty();
+verify.completionListAllowsNewIdentifier();