Modify the loading screen for cloud

SequenceServer Cloud users can get email notifications when long
running jobs complete, tweak the results loading page to indicated
that.

package.json

@@ -10,11 +10,11 @@
   },
   "scripts": {
     "watch": "webpack --watch",
-    "watch-cloud": "webpack --watch --env=reportPluginsPath='../sequence_server_js_extensions/report_plugins.js' --env=downloadLinks='../sequence_server_js_extensions/conserved_domains/download_links.js' --env=hitButtons='../sequence_server_js_extensions/hit_buttons.js'",
+    "watch-cloud": "webpack --watch --env=reportPluginsPath='../sequence_server_js_extensions/report_plugins.js' --env=downloadLinks='../sequence_server_js_extensions/conserved_domains/download_links.js' --env=hitButtons='../sequence_server_js_extensions/hit_buttons.js' --env=targetEnv='cloud'",
     "test": "jest",
     "minify:css": "cleancss public/css/sequenceserver.css > public/css/sequenceserver.min.css",
     "build": "webpack && npm run minify:css",
-    "build-cloud": "webpack --env=reportPluginsPath='../sequence_server_js_extensions/report_plugins.js' --env=downloadLinks='../sequence_server_js_extensions/conserved_domains/download_links.js' --env=hitButtons='../sequence_server_js_extensions/hit_buttons.js' && npm run minify:css"
+    "build-cloud": "webpack --env=reportPluginsPath='../sequence_server_js_extensions/report_plugins.js' --env=downloadLinks='../sequence_server_js_extensions/conserved_domains/download_links.js' --env=hitButtons='../sequence_server_js_extensions/hit_buttons.js' --env=targetEnv='cloud' && npm run minify:css"
   },
   "dependencies": {
     "babel-plugin-transform-export-extensions": "^6.22.0",

public/js/report.js

@@ -273,6 +273,9 @@ class Report extends Component {
                         <br />
             You can bookmark the page and come back to it later or share the
             link with someone.
+                        <br />
+                        <br />
+                        { process.env.targetEnv === 'cloud' && <b>If the job takes more than 10 minutes to complete, we will send you an email upon completion.</b> }
                     </p>
                 </div>
             </div>

webpack.config.js

@@ -37,7 +37,7 @@ module.exports = (env, argv)  => {
                 $: 'jquery',
                 jQuery: 'jquery',
             }),
-            new webpack.EnvironmentPlugin({ NODE_ENV: 'development' }),
+            new webpack.EnvironmentPlugin({ NODE_ENV: 'development', targetEnv: env.targetEnv || 'standalone'}),
             new webpack.DefinePlugin({
                 process: { env: {} },
             })