Improvements and fixes to JSON introspection schema build (#164, #216, #217)

- Fixed missing newline in test

Author: jimkyndemeyer

src/test/com/intellij/lang/jsgraphql/ide/editor/GraphQLIntrospectionHelperTest.java

@@ -43,7 +43,7 @@ public void testPrintIntrospectionJsonAsGraphQL() {
                 "  \"Лорем ипсум долор [\\\\d]\"\n" +
                 "  posts: [Post]\n" +
                 "}\n" +
-                "\n" +
+                "\n\n" +
                 "\"The `JSON` scalar type represents JSON values as specified by [ECMA-404](http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf).\"\n" +
                 "scalar JSON";