Enhanced support for JRockit 1.5 / 1.6 (issue #45)

- Support for older JRockit 1.5 (upto update 14) log file format 
- Fixed a parse bug in an obscure version/flag combination in JRockit 1.5_12
- Fixed JRockit 1.5 reader bug when verbose timestamp is disabled
- Added enhancement for JRockit 1.6 reader to ignore some new diagnostic logs added in update 30
- Fixed logic for JRockit version check in DataReaderFactory. Was miscategorizing some 1.6 logs as 1.5
- New JRockit test files
add junit tests for DataReaderJRockit 1.5 + 1.6