[maven-release-plugin] prepare release jacoco-1.0.18
[maven-release-plugin] prepare for next development iteration
JENKINS-16580: extract graph creation, add test helpers and create initial test
JENKINS-16580: add test method for manually writing the graph to disk
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!!)
JENKINS-16580: add plot color
JENKINS-16580: ignore empty coverage value
JENKINS-16580: crop plots to fit screen with extra margin