tidy up and improve maven 3 support

Made some additional changes to fix a few broken things in the new
maven3 configuration:
   - restore jsamp.version file (was causing test failures)
   - cosmetic changes to pom.xml (whitespace)
   - added scm and URL info to pom
   - changed target J2SE to 1.4
   - tweaked CSS
   - fixed snipped inclusion bug (filename typo)