To Do:
- Configuration
	- User Preferences - store in an XML file (username.xml)
- User Authentication -> ProxyServer
	- passes username string to Raveler, which creates a RavelerUser object
- Virtual URLs
	- added when plugins are initialized (issue: what if plugins need to
	  create virtual URLs while they are executing - Annotations)
	- stored in a Hashtable in Raveler - passed to RavelerManager when a request comes in
- API
	- Initialization methods
		- UI
		- Configuration/Help - virtual URLs
	- Execution methods (static)
		- Modifying HTML
		- Error/Warning
		- add method to Raveler: String insertRavelerBanner(String page)
- RavelerManager's handling of sending HTTPMessages to plugins
	- Plugin stack passed from Raveler