Create a simple chat app

Show us how you would code a simple web chat application!

As a web developer, you've certainly used a web chat before, and maybe you have even coded one before.
Let's see if you can use these customer/client stories, and all your skills as a dev, to create a nice, simple chat app.

Here are the stories:

- As a customer, Bob want to chat on the website with other customers, so he can be part of the community.
- As a customer, Jane wants to choose a username, send some chat messages, and see her chats even after a page reload.
- As a corporate admininstrator, Greg wants the chat to get a nice initially designed template, so he can can present it as part of a corporate retreat.
- As the webadmin, Joe wants the chat to use a modern approach so that it doesn't add much load to the web server.

(No need to code authentication, you can pretend that 1 username === 1 individual)

Please show your work by coding it in a git repository with commits (on github or bitbucket is great, 
or just zip up the repo with files).
We're only looking for you to spend two or three hours on this.  Show us what you can get done in a short time!