Update README.md
started experimenting with jacoco support
refactored JettyAfterIntegrationTestTask.setupIntegrationTestTaskDependencies
setupIntegrationTestCoverageReportTask -> setupIntegrationTestClientCoverageReportTask
Merge origin/jacoco_support into jacoco_support

Conflicts:
	libs/gretty-plugin-commons/src/main/groovy/org/akhikhl/gretty/JettyAfterIntegrationTestTask.groovy