Add kernel modules and basic kernel handling

src/http/kernel/module/PoweredByHeaderInjectionHTTPModule.ts

@@ -0,0 +1,17 @@
+import {HTTPKernelModule} from "../HTTPKernelModule";
+import {Request} from "../../lifecycle/Request";
+import {Injectable} from "@extollo/di"
+import {HTTPKernel} from "../HTTPKernel";
+
+@Injectable()
+export class PoweredByHeaderInjectionHTTPModule extends HTTPKernelModule {
+    public static register(kernel: HTTPKernel) {
+        kernel.register(this).after()
+    }
+
+    public async apply(request: Request) {
+        // FIXME make this configurable
+        request.response.setHeader('X-Powered-By', 'Extollo')
+        return request
+    }
+}