Sets the defaultSchemas keys in the SchemaCollection (#1421)

* Sets the defaultSchemas keys in the SchemaCollection

* Moves defaultSchema injection logic to router

* maps outside the function

* fixes test

* conciseness

spec/schemas.spec.js

@@ -326,6 +326,35 @@ describe('schemas', () => {
     });
   });
 
+  it('responds with all fields when getting incomplete schema', done => {
+    config.database.schemaCollection().then((schema) => {
+      return schema.addSchema('_User');
+    }).then(() => {
+      request.get({
+        url: 'http://localhost:8378/1/schemas/_User',
+        headers: masterKeyHeaders,
+        json: true
+      }, (error, response, body) => {
+        expect(body).toEqual({
+          className: '_User',
+          fields: {
+            objectId: {type: 'String'},
+            updatedAt: {type: 'Date'},
+            createdAt: {type: 'Date'},
+            username: {type: 'String'},
+            password: {type: 'String'},
+            authData: {type: 'Object'},
+            email: {type: 'String'},
+            emailVerified: {type: 'Boolean'},
+            ACL: {type: 'ACL'}
+          },
+          classLevelPermissions: defaultClassLevelPermissions
+        });
+        done();
+      });
+    })
+  });
+
   it('lets you specify class name in both places', done => {
     request.post({
       url: 'http://localhost:8378/1/schemas/NewClass',