Aggregate coverage using Jacoco

Before, e.g. Parser.Builder.extensions wasn't shown as being covered at
all, probably because the integration tests that use it are in a
different module.

By letting Jacoco aggregate the results and then have Coveralls submit
that, the coverage seems to be correct now.

Author: robinst

.travis.yml

@@ -20,7 +20,7 @@ script:
   - 'if [[ $TEST = android ]]; then mvn install -DskipTests && cd commonmark-android-test && travis_retry ./.travis.sh; fi'
 deploy:
   provider: script
-  script: mvn clean test jacoco:report coveralls:report -Pcoverage
+  script: mvn clean test coveralls:report -Pcoverage
   on:
     jdk: oraclejdk8
     condition: "$TEST = java"

commonmark-integration-test/pom.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <parent>
         <groupId>com.atlassian.commonmark</groupId>
@@ -15,28 +16,24 @@
         <dependency>
             <groupId>com.atlassian.commonmark</groupId>
             <artifactId>commonmark</artifactId>
-            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>com.atlassian.commonmark</groupId>
             <artifactId>commonmark-ext-autolink</artifactId>
-            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>com.atlassian.commonmark</groupId>
             <artifactId>commonmark-ext-gfm-strikethrough</artifactId>
-            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>com.atlassian.commonmark</groupId>
             <artifactId>commonmark-ext-gfm-tables</artifactId>
-            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>com.atlassian.commonmark</groupId>
             <artifactId>commonmark-ext-yaml-front-matter</artifactId>
-            <scope>test</scope>
         </dependency>
+
         <dependency>
             <groupId>org.pegdown</groupId>
             <artifactId>pegdown</artifactId>
@@ -61,6 +58,33 @@
         </dependency>
     </dependencies>
 
+    <profiles>
+        <profile>
+            <id>coverage</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.jacoco</groupId>
+                        <artifactId>jacoco-maven-plugin</artifactId>
+                        <configuration>
+                            <!-- This is where coveralls expects the files to be, so just put it there. -->
+                            <outputDirectory>${project.parent.reporting.outputDirectory}/jacoco</outputDirectory>
+                        </configuration>
+                        <executions>
+                            <execution>
+                                <id>report-aggregate</id>
+                                <goals>
+                                    <goal>report-aggregate</goal>
+                                </goals>
+                                <phase>test</phase>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
     <build>
         <plugins>
             <plugin>