+ Dtos and entities have Date objects instead of String for start-end dates
Merge branch 'master' of github.com:griddynamics/jagger into ui-summary-date-format

Conflicts:
	chassis/core/src/main/java/com/griddynamics/jagger/engine/e1/reporting/SummaryReporter.java
+ date format into FormatCalculator
Update Trends.java

protected -> private DateTimeFormat field in Trends
Merge pull request #552 from amikryukov/ui-summary-date-format

Ui summary table - format dates with one method for session and test info