Add support for testing coverage reports

[bautrey37]

trautonen/coveralls-maven-plugin#112

Configure local Coveralls token and run locally like this: mvn jacoco:report coveralls:report -DrepoToken=$COVERALLS_TOKEN

Result:

 Execution default-cli of goal org.eluder.coveralls:coveralls-maven-plugin:4.3.0:report failed: A required class was missing while executing org.eluder.coveralls:coveralls-maven-plugin:4.3.0:report: javax/xml/bind/DatatypeConverter

There is a fix deployed to master, but it is not deployed to the maven repository, so there is no way to reference a version of the new fix.

[bautrey37]

Not fixed. Need to implement report aggregation with Jacoco. This is a working example from jacoco.

[bautrey37]

https://github.com/jacoco/jacoco/tree/master/jacoco-maven-plugin.test/it/it-report-aggregate

[victorgveloso]

You might need to add javax.xml.bind:jaxb-api as coveralls-maven-plugin dependency. Like this:

      <plugin>
          <groupId>org.eluder.coveralls</groupId>
          <artifactId>coveralls-maven-plugin</artifactId>
          <version>${build-plugin.coveralls.version}</version>
          <dependencies>
            <dependency>
                <groupId>javax.xml.bind</groupId>
                <artifactId>jaxb-api</artifactId>
                <version>2.3.1</version>
            </dependency>
          </dependencies>
      </plugin>