method for getting useful build and version information. TODO: Splash should call this to get version, not the other way around.
return HTML code describing the release version, Java version, build time, etc.
searches class path for META-INF/build.txt, returns nice strings
Identify the release by looking for build.jenkinsURL . It's expected that the build script will insert build.tag into META-INF/build.txt
return the tag assigned to the class, but looking for "META-INF/build.txt" in the jar file.
evaluate if the current JRE version is at least a given level. This was introduced that