Merge pull request #20 from Bezuhlyi/master

MSK-155: MoSKito-Ehcache integration module
fixed dependency to parent version to 2.4.2
updated some deps
removed ehcache from integration project
[maven-release-plugin] prepare release moskito-2.4.2
[maven-release-plugin] prepare for next development iteration
readded ehcache integration
Merge branch 'master' of github.com:anotheria/moskito
added moskito-extensions, added moskito-notification-providers, added MailgunNotificationProvider
Unnecessary declaration removed.
Package layout changed.