Mail notifications config improvement:
- Configurable list of email notification recipients
- SMTP port is configurable now
- defaultMessageSender param moved to mail.json config
ThresholdsUpdater configuration example added to moskito-control.json config
Javadoc fix
Merge pull request #45 from dvayanu/master

fixed stalling moskito-control bug
Merge pull request #44 from Bezuhlyi/master

Mail notifications config improvement and small stuff
Changed headlines, added sections and data flow picture
Fixed link to Quick Setup guide