Test that the minimal and sample configs pass validation

test/test_configschema.ts

+import * as yaml from "js-yaml";
+import * as Chai from "chai";
+import { ConfigValidator } from "matrix-appservice-bridge";
+
+const expect = Chai.expect;
+
+describe("ConfigSchema", () => {
+    const validator = new ConfigValidator("./config/config.schema.yaml");
+    it("should successfully validate a minimal config", () => {
+        const yamlConfig = yaml.safeLoad(`
+            bridge:
+                domain: localhost
+                homeserverUrl: "http://localhost:8008"
+            auth:
+                clientID: foo
+                botToken: foobar`);
+        validator.validate(yamlConfig);
+    });
+    it("should successfully validate the sample config", () => {
+         validator.validate("./config/config.sample.yaml");
+    });
+});