Added custom authorizer sample (#246)

Adds custom authorizer support and samples!

Commit log:
* Added custom authorizer sample
* Renamed codebuild to proper name
* Added custom authorizer connect sample for the browser
* Added custom authorizer documentation to the README
* Added missing header links to the samples in the README
* Fixed README headers not being correct for custom authorizer sample
* Updated to use latest CRT release
* Rebuilt using an older version of node so the package-lock version is correct
* Regenerated package-lock.json with clean node run

Author: TwistedTwigleg

codebuild/samples/connect-custom-authorizer-linux.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+set -e
+
+env
+
+pushd $CODEBUILD_SRC_DIR/samples/node/custom_authorizer_connect
+
+ENDPOINT=$(aws secretsmanager get-secret-value --secret-id "unit-test/endpoint" --query "SecretString" | cut -f2 -d":" | sed -e 's/[\\\"\}]//g')
+AUTH_NAME=$(aws secretsmanager get-secret-value --secret-id "unit-test/authorizer-name" --query "SecretString" | cut -f2 -d":" | sed -e 's/[\\\"\}]//g')
+AUTH_PASSWORD=$(aws secretsmanager get-secret-value --secret-id "unit-test/authorizer-password" --query "SecretString" | cut -f2 -d":" | sed -e 's/[\\\"\}]//g')
+
+npm install --unsafe-perm
+
+echo "Custom Authorizer Connect test"
+node dist/index.js --endpoint $ENDPOINT --custom_auth_authorizer_name $AUTH_NAME --custom_auth_password $AUTH_PASSWORD
+
+popd

codebuild/samples/linux-smoke-tests.yml

@@ -9,6 +9,7 @@ phases:
       - echo Build started on `date`
       - $CODEBUILD_SRC_DIR/codebuild/samples/setup-linux.sh
       - $CODEBUILD_SRC_DIR/codebuild/samples/connect-linux.sh
+      - $CODEBUILD_SRC_DIR/codebuild/samples/connect-custom-authorizer-linux.sh
   post_build:
     commands:
       - echo Build completed on `date`

lib/browser.ts

@@ -0,0 +1,20 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+/**
+ * Browser entry point for AWS IoT SDK.
+ * @packageDocumentation
+ * @module aws-iot-device-sdk
+ * @preferred
+ */
+
+import { mqtt, http, io, iot } from 'aws-crt/dist.browser/browser';
+
+export {
+    mqtt,
+    http,
+    io,
+    iot
+}