Added Maven Shade plugin transformer to not only merge Java standard MANIFEST entries but also OSGi metadata

Conflicts:
	hazelcast-all/pom.xml
Fixed checkstyle configuration
Fixed checkstyle and excluded ElementParser from checks since it's taken from another project

Conflicts:
	checkstyle/suppressions.xml
Fixed findbugs
Fixed package export
Fixed checkstyle
Changed pom.xml version
Merge pull request #2894 from noctarius/buildutils-backport

Buildutils backport