Single qz.ks, updated jssc to 2.8.0

Made all projects use a single qz.ks:
jnlp.signing.keystore=${src.dir}/../../qz.ks

Updated jssc to latest (2.6.0 -> 2.8.0) and modified to compile on JDK
1.5.
Merge pull request #3 from tresf/master

Single qz.ks, updated jssc to 2.8.0