Use the resources supplied by the classloader to load the manifest file
absolute / relative file sytem paths dont work anymore because when you
run this in a servlet container everything is relative to its context
hence we use the right method of loading resources
we probably need a better key to the implmenetation version - because if
there exists another manifest file with the same key in the same servlet
container we are doomed as we return its implementation version
Fixed the build.xml to produce the correct
manifest in the voldemort jar
Fixed comments
Fixed warning message