travis: Add coverage reporting using coveralls

Author: robinst

.travis.yml

@@ -2,3 +2,8 @@ language: java
 jdk:
   - openjdk7
   - oraclejdk8
+deploy:
+  provider: script
+  script: mvn clean test jacoco:report coveralls:report -Pcoverage
+  on:
+    jdk: oraclejdk8

pom.xml

@@ -123,6 +123,31 @@
                 </dependency>
             </dependencies>
         </profile>
+        <profile>
+            <id>coverage</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.jacoco</groupId>
+                        <artifactId>jacoco-maven-plugin</artifactId>
+                        <version>0.7.7.201606060606</version>
+                        <executions>
+                            <execution>
+                                <id>prepare-agent</id>
+                                <goals>
+                                    <goal>prepare-agent</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.eluder.coveralls</groupId>
+                        <artifactId>coveralls-maven-plugin</artifactId>
+                        <version>4.2.0</version>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
         <profile>
             <id>release</id>
             <build>