+ CumulativeMetricAggregatorProvider for cumulative monitoring parameters
+ 2 doubles is enough
+ move logic of new interval to reset() method
+ add createAggregatorSuffix method to wrap aggregator`s name (more pleasant representation)
- bug fix in MonitoringAggregator
Merge branch 'master' of github.com:griddynamics/jagger into aggregator-for-cumulative-metrics

Conflicts:
	chassis/core/src/main/java/com/griddynamics/jagger/engine/e1/aggregator/workload/MetricLogProcessor.java
+ add CumulativeMetricAggregator to cumulative monitoring metric
+ save time stamp of monitoring parameter that comes from Agent
Merge pull request #440 from amikryukov/aggregator-for-cumulative-metrics

JFG-651 create aggregators required to store monitoring metrics