Improved logging of RulesProvider -  on -DSTACKTRACE=true, log stacktrace of deserialization errors for being able to analyze such problems
[IZPACK-951] - Implemented basic JAXB (de)serialization of rules (conditions)
[IZPACK-950] Installer does not resolve user conditions with IBM JRE 1.6.0
Merge pull request #102 from rkrell/IZPACK-950

Fix for IZPACK-950