Improve compilation speed for development builds (#402)

* Improve incremental build times
* Live-reloading in development mode

client/js/controllers/home_controller.js

@@ -17,6 +17,7 @@ class HomeController {
             buildDate: config.meta.buildDate,
             canListSnapshots: api.hasPrivilege("snapshots:list"),
             canListPosts: api.hasPrivilege("posts:list"),
+            isDevelopmentMode: config.environment == "development"
         });
 
         Info.get().then(