Watch and build components

[honglio]

This proposition removes per request builds and introduces:

Watching lib/client/* and building to public.
Watching public and reloading browser page.
Watching lib/server/*, reloading the server and reloading browser page.
We could use https://github.com/nodejitsu/forever-monitor, probably with grunt-watch. This is ready to start.

[honglio]

Requires:

Compiling LESS files
Compiling Jade files in lib/client
Building requirejs

[honglio]

nodemon can do watch server file and reload the server. For applying the change in browser, like public/server file change we just need to refresh the browser. So no need for grunt-watch.