Merge pull request #45 from jglick/java-8

Restore ability to use library from Java 8-based clients

pom.xml

@@ -5,13 +5,14 @@
         <groupId>org.jenkins-ci</groupId>
         <artifactId>jenkins</artifactId>
         <version>1.88</version>
-        <relativePath />
+        <relativePath/>
     </parent>
     <groupId>org.jenkins-ci.test</groupId>
     <artifactId>docker-fixtures</artifactId>
     <version>${changelist}</version>
     <name>Docker Fixtures</name>
     <description>Docker rule for JUnit.</description>
+    <url>https://github.com/jenkinsci/docker-fixtures</url>
     <repositories>
         <repository>
             <id>repo.jenkins-ci.org</id>
@@ -54,6 +55,7 @@
         <gitHubRepo>jenkinsci/docker-fixtures</gitHubRepo>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <spotbugs.failOnError>false</spotbugs.failOnError> <!-- TODO -->
+        <maven.compiler.release>8</maven.compiler.release> <!-- TODO until dropping Java 8 support in consuming plugins -->
     </properties>
     <dependencies>
         <dependency>