[REF] owl: reorganize exports, remove registry, remove web example

closes #38

src/index.ts

@@ -1,7 +1,6 @@
 export { Component, PureComponent } from "./component";
 export { EventBus } from "./event_bus";
 export { QWeb } from "./qweb";
-export { Registry } from "./registry";
 export { connect, Store } from "./store";
 import * as _utils from "./utils";
 

src/registry.ts

@@ -1,28 +0,0 @@
-/**
- * The registry is basically a simple hashmap. It is only a little safer and
- * more structured than a simple object.
- */
-export class Registry<T> {
-  private map: { [key: string]: T } = {};
-
-  /**
-   * Add an element to the registry.  Note that the add method returns the
-   * registry, to it can be chained.
-   */
-  add(key: string, item: T): Registry<T> {
-    if (key in this.map) {
-      throw new Error(`Key ${key} already exists!`);
-    }
-    this.map[key] = item;
-    return this;
-  }
-
-  /**
-   * Returns the element corresponding to the key
-   *
-   * Nothing is done to check that the key actually exists.
-   */
-  get(key: string): T | undefined {
-    return this.map[key];
-  }
-}