Created a tools module under a "tools" Maven profile, moved the other three modules to a separate profile that is active by default.
Added log4j.properties.
Added first tool, HttpResourceMonitor. Sends an HTTP request over and over and logs changes in responses.

Usage:

HttpResourceMonitor [host [resource]]

where
* host is HTTP host (default: "localhost")
* resource is path to resource on the host (default: "/")