Make integrative test run as during phase verify.

Right now java-gitlab-api fails during Maven phase test when no
GITLAB instance is running on localhost.

Make this test run during `mvn verify` only and check beforehand
whether the GITLAB instance is reachable. Furthermore the
instance-under-test may be changed by adding two system properties
during invocation.

Running:
```
mvn clean verify -DTEST_TOKEN=ADMIN_TOKEN -DTEST_URL=https://GITLAB_URL
```
will pick up the values and use this instance/token.

pom.xml

@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.sonatype.oss</groupId>
         <artifactId>oss-parent</artifactId>
-        <version>7</version>
+        <version>9</version>
     </parent>
 
     <developers>
@@ -61,6 +61,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     </properties>
 
     <dependencies>
@@ -104,6 +105,30 @@
                     <target>1.6</target>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.17</version>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-failsafe-plugin</artifactId>
+                <version>2.17</version>
+                <executions>
+                    <execution>
+                        <id>default-integration-test</id>
+                        <goals>
+                            <goal>integration-test</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>default-verify</id>
+                        <goals>
+                            <goal>verify</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>

src/test/java/org/gitlab/api/GitlabAPITest.java → src/test/java/org/gitlab/api/GitlabAPIT.java

 package org.gitlab.api;
 
 import org.gitlab.api.models.GitlabUser;
+import static org.hamcrest.CoreMatchers.is;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
@@ -11,21 +12,33 @@ import java.net.URL;
 import java.util.UUID;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assume.assumeNoException;
+import static org.junit.Assume.assumeThat;
 
-public class GitlabAPITest {
+import java.net.ConnectException;
+
+public class GitlabAPIT {
 
     GitlabAPI _api;
     
-    private static final String TEST_URL = "http://localhost";
-    private static final String TEST_TOKEN = "y0E5b9761b7y4qk";
+    private static final String TEST_URL = System.getProperty("TEST_URL", "http://localhost");
+    private static final String TEST_TOKEN = System.getProperty("TEST_TOKEN", "y0E5b9761b7y4qk");
     
 	String rand = UUID.randomUUID().toString().replace("-", "").substring(0, 8);
 	
 	
 
     @Before
-    public void setup() {
+    public void setup() throws IOException {
         _api = GitlabAPI.connect(TEST_URL, TEST_TOKEN);
+        try {
+            _api.dispatch().with("login", "INVALID").with("password", rand).to("session", GitlabUser.class);
+        } catch (ConnectException e) {
+            assumeNoException("GITLAB not running on localhost, skipping...", e);
+        } catch (IOException e) {
+            final String message = e.getMessage();
+            assumeThat(message, is("{\"message\":\"401 Unauthorized\"}"));
+        }
     }
 
     @Test