Es6 cmp migration (#113)

* migrate Alert component

* convert Mainlist component

* add webpack watch task

* update build script for different manifests

* add types for api responses

* convert changeExtensionIcon

* convert inArray, getDomainParts, contains to ts

* convert changeExtensionTooltip

* convert changeExtensionState to ts

src/utils/getDomainFromUrl.ts

@@ -0,0 +1,8 @@
+/**
+ * Returns domain from given URL.
+ */
+export function getDomainFromUrl(url: string): string {
+  const parts = url.split('/');
+
+  return parts[0] + '//' + parts[2];
+}