Initial commit

Features:
- Based on JSAPI sample for adding graphics
http://help.arcgis.com/en/webapi/javascript/arcgis/jssamples/#sample/graphics_add
- Every logged in client gets their own graphics layer, and their own
randomly assigned name.
- Every client's graphics layer gets their own random color.
- Clients can change their own name.
- Can add points and lines by any client and it will show up for other
client in real-time.
- Once a client logs out, their graphics layer gets removed.
- Code commented with brief description.