Added storing of deployment time on first application launch
Using deployment time to not fetch events (issues) with time before deployment time and issue changes before that time
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/com/ontometrics/integrations/sources/SourceEventMapper.java
	src/test/java/ontometrics/integrations/sources/SourceEventMapperTest.java
Merge conflicts resolution