#73: Added Tomcat 8 support
#73: Ups.. Added lost dependency (tomcat8x) in the plugin.
#73: Extract the common code of Tomcat server.
#73: New-old way for determining Tomcat version.
#73: Added base implementation for Tomcat 7.x and 8.x.
#73: New logic for resolving Tomcat server implementation.
#73: README file updated for Tomcat 8.x.
Simplified code and added more tests.
Set temporary directory for Tomcat home in tests.
Created source set for integration tests.
Renamed  integration tests and prepared tests for running the plugin as Gradle build.
First cut of running Tomcat tasks within integration tests.