Fix calculation errors:
* Zero response times were not calculated and thus the 
  number of requests was incorrect
* Agent requests were erroneously considered in aggregated execution 
  times
Improve GC log reporting
Automatically create missing output directory
Fix script
Removed extension from shell script
Write out content to merged file as is. Quoting must be preserved.
Fix assembly
Narrower selection of perfMon files
Update to Java 7