Add automatic range for summary chart (for better performance)
default: compute average time for each seconds of run
scaling level 1: compute average time for every 10 seconds of run
scaling level 2: compute average time for every 60 seconds of run

Switch between scaling can be configured in properties file
- level1: report.scaling.level1.seconds (default  300 - 5 minutes)
- level2: report.scaling.level2.seconds (default 3600 - 1 hour)

Fix #29