Add jagger-thread metric
Merge from master. Clean code
Fix NPE in WorkloadTask
Docu for success rate metric implemented
Clean code
Merge pull request #297 from dlatnikov/JFG-460_success_rate_docu

Docu for success rate metric implemented
log level of report generation is moved from INFO to DEBUG
Add comment about collector name
Merge pull request #296 from kgribov/CalculatorAggregator

Thread count feature
Merge pull request #298 from dlatnikov/JFG-443_log_level_of_report_plots

log level of report generation is moved from INFO to DEBUG
jfg-531
check null values from tables.
show "no name matrics" in pdf(summary tab with 1 sesion chosen) view.
ignore such metrics in table view.