adds coverage with jacoco
Merge branch 'master' of https://github.com/Coinhunter/MultiGradleSubmodule

Conflicts:
	build.gradle
	build/jacoco/test.exec
	build/reports/tests/classes/se.coinhunter.multigradlesubmodule.tests.HelloWorldTest.html
	build/reports/tests/index.html
	build/reports/tests/packages/se.coinhunter.multigradlesubmodule.tests.html
	build/test-results/TEST-se.coinhunter.multigradlesubmodule.tests.HelloWorldTest.xml
	build/test-results/binary/test/results.bin