Add a setenv.bat for Windows Tomcatters
Avoid using environment variables for gem paths
Work around byte count differences under Windows.

Somehow the number we get from java.io.File.length doesn't match the number of
bytes we're reading (off by 3).  Mysterious!

Added a workaround for now, until enlightenment is reached.
Doc draft
New guide for setting up Tomcat as a Windows service
Update Tomcat README to mention the Windows release of Tomcat