JENKINS-16580: make test system independent
JENKINS-16580: extract coverage graph layout
JENKINS-16580: add baseStroke to layout
JENKINS-16580: prepare method for all combination of coverage information
JENKINS-16580: allow different coverage types and multiple axis (key commit!!)

Conflicts:
	src/test/java/hudson/plugins/jacoco/model/CoverageObjectGraphTest.java
JENKINS-16580: add plot color

Conflicts:
	src/test/java/hudson/plugins/jacoco/model/CoverageObjectGraphTest.java
JENKINS-16580: add plot color
JENKINS-16580: ignore empty coverage value
JENKINS-16580: crop plots to fit screen with extra margin