Added support for JaCoCo code coverage reports.

pom.xml

 <?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/maven-v4_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/maven-v4_0_0.xsd">
 
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.gitlab4j</groupId>
@@ -38,12 +39,12 @@
 	</developers>
 
 	<properties>
-        <jdk.version>1.7</jdk.version>
-        <jersey.version>2.25.1</jersey.version>
-        <jackson.version>2.8.6</jackson.version>
-        <junit.version>4.12</junit.version>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+		<jdk.version>1.7</jdk.version>
+		<jersey.version>2.25.1</jersey.version>
+		<jackson.version>2.8.6</jackson.version>
+		<junit.version>4.12</junit.version>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 	</properties>
 
 	<scm>
@@ -125,6 +126,60 @@
 					</execution>
 				</executions>
 			</plugin>
+
+			<plugin>
+				<groupId>org.jacoco</groupId>
+				<artifactId>jacoco-maven-plugin</artifactId>
+				<version>0.7.9</version>
+				<executions>
+					<execution>
+						<id>default-prepare-agent</id>
+						<goals>
+							<goal>prepare-agent</goal>
+						</goals>
+					</execution>
+					<execution>
+						<id>default-report</id>
+						<phase>prepare-package</phase>
+						<goals>
+							<goal>report</goal>
+						</goals>
+
+					</execution>
+					<execution>
+						<id>default-check</id>
+						<goals>
+							<goal>check</goal>
+						</goals>
+						<configuration>
+							<rules>
+								<!-- implementation is needed only for Maven 2 -->
+								<rule implementation="org.jacoco.maven.RuleConfiguration">
+									<element>BUNDLE</element>
+									<limits>
+										<!-- implementation is needed only for Maven 2 -->
+										<limit implementation="org.jacoco.report.check.Limit">
+											<counter>COMPLEXITY</counter>
+											<value>COVEREDRATIO</value>
+											<minimum>0.60</minimum>
+										</limit>
+									</limits>
+								</rule>
+							</rules>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>2.12.2</version>
+				<configuration>
+					<systemPropertyVariables>
+						<jacoco-agent.destfile>target/jacoco.exec</jacoco-agent.destfile>
+					</systemPropertyVariables>
+				</configuration>
+			</plugin>
 		</plugins>
 	</build>