Add Appveyor builds and webdriver.io tests (tests cover Angular2Spa template only at present)

test/templates/util/webdriverio.ts

@@ -0,0 +1,12 @@
+// Workaround for missing '.value' property on WebdriverIO.Client<RawResult<T>> that should be of type T
+// Can't notify TypeScript that the property exists directly, because the interface merging feature doesn't
+// appear to support pattern matching in such a way that WebdriverIO.Client<T> is extended only when T
+// itself extends RawResult<U> for some U.
+export function getValue<T>(client: WebdriverIO.Client<WebdriverIO.RawResult<T>>): T {
+    return (client as any).value;
+}
+
+// The official type declarations for getCssProperty are completely wrong. This function matches runtime behaviour.
+export function getCssPropertyValue<T>(client: WebdriverIO.Client<T>, selector: string, cssProperty: string): string {
+    return (client.getCssProperty(selector, cssProperty) as any).value;
+}