Fixes for Class Level and Pointer Permissions (#1989)

* Fixes for Pointer Permissions

- Fix bug that would leave public CLP when setting a new set of permissions
- Sets empty permissions if missing to match parse.com API
- Updates tests to reflect changes

* Adds regression test for #1991

* Fit -> It

spec/Schema.spec.js

@@ -132,6 +132,7 @@ describe('SchemaController', () => {
         var get = {};
         get[user.id] = true;
         return schema.setPermissions('Stuff', {
+          'create': {'*': true},
           'find': find,
           'get': get
         });
@@ -152,6 +153,7 @@ describe('SchemaController', () => {
           done();
         }, (e) => {
           fail('Class permissions should have allowed this get query');
+          done();
         });
       });
     });