Adds support for coveralls

.travis.yml

@@ -6,4 +6,7 @@ jdk:
   - oraclejdk8
 
 install: true
-script: mvn test -DskipAssembly
+script: mvn test -DskipAssembly
+
+after_success:
+  - mvn clean cobertura:cobertura coveralls:report -Ptravis-coveralls -DskipAssembly

pom.xml

@@ -166,6 +166,10 @@
             <activation>
                 <jdk>9</jdk>
             </activation>
+            <properties>
+                <!-- coverall version 4.3.0 does not work with java 9, see https://github.com/trautonen/coveralls-maven-plugin/issues/112 -->
+                <coveralls.skip>true</coveralls.skip>
+            </properties>
             <build>
                 <pluginManagement>
                     <plugins>
@@ -180,6 +184,32 @@
                 </pluginManagement>
             </build>
         </profile>
+        <profile>
+            <id>travis-coveralls</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.codehaus.mojo</groupId>
+                        <artifactId>cobertura-maven-plugin</artifactId>
+                        <version>2.7</version>
+                        <configuration>
+                            <format>xml</format>
+                            <maxmem>256m</maxmem>
+                            <!-- aggregated reports for multi-module projects -->
+                            <aggregate>true</aggregate>
+                        </configuration>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.eluder.coveralls</groupId>
+                        <artifactId>coveralls-maven-plugin</artifactId>
+                        <version>4.3.0</version>
+                        <configuration>
+                            <repoToken>${env.coveralls_repo_token}</repoToken>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
     </profiles>
 
     <build>