Added additional Group API calls.

src/main/java/com/messners/gitlab/api/GroupApi.java

+package com.messners.gitlab.api;
+
+import java.io.IOException;
+import java.util.List;
+
+import com.messners.gitlab.api.models.Group;
+import com.messners.gitlab.api.models.Member;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.GenericType;
+
+public class GroupApi extends AbstractApi {
+
+	GroupApi (GitLabApi gitLabApi) {
+		super(gitLabApi);
+	}
+	
+
+	/**
+	 * GET /groups
+	 * 
+	 * @return
+	 * @throws IOException
+	 */
+	public List<Group> getGroups () throws IOException {	
+		 ClientResponse response = get(null, "groups");
+		 return (response.getEntity(new GenericType<List<Group>>() {}));
+	}
+	
+	
+	/**
+	 * GET /groups/:id
+	 * 
+	 * @param groupId
+	 * @return
+	 * @throws IOException
+	 */
+	public Group getGroup (int groupId) throws IOException {
+		ClientResponse response = get(null, "groups", groupId);
+		return (response.getEntity(Group.class));
+	}
+	
+	
+	/**
+	 * DELETE /groups/:id
+	 * 
+	 * @param groupId
+	 * @return
+	 * @throws IOException
+	 */
+	public boolean deleteGroup (Integer groupId)  throws IOException {
+		
+		if (groupId == null) {
+			throw new RuntimeException("groupId cannot be null");
+		}
+		
+		ClientResponse response = delete(null, "groups", groupId);
+		return (response.getStatus() == ClientResponse.Status.OK.getStatusCode());		
+	}
+
+	
+	/**
+	 * 
+	 * @param group
+	 * @return
+	 * @throws IOException
+	 */
+	public boolean deleteGroup (Group group)  throws IOException {
+		return (deleteGroup(group.getId()));
+	}
+
+	
+	/**
+	 * GET /groups/:id/members
+	 * 
+	 * @return
+	 * @throws IOException
+	 */
+	public List<Member> getMembers (int groupId) throws IOException {	
+		 ClientResponse response = get(null, "groups", groupId, "members");
+		 return (response.getEntity(new GenericType<List<Member>>() {}));
+	}
+}

src/main/java/com/messners/gitlab/api/models/Group.java

 
 package com.messners.gitlab.api.models;
 
+import java.util.List;
+
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlRootElement;
@@ -13,6 +15,7 @@ public class Group {
 	private String name;
 	private Integer ownerId;
 	private String path;
+	private List<Project> projects;
 
 	public Integer getId () {
 		return this.id;
@@ -45,4 +48,12 @@ public class Group {
 	public void setPath (String path) {
 		this.path = path;
 	}
+	
+	public List<Project> getProjects () {
+		return (projects);
+	}
+	
+	public void setProjects (List<Project> projects) {
+		this.projects = projects;
+	}
 }

src/main/java/com/messners/gitlab/api/models/Member.java

@@ -10,6 +10,12 @@ import javax.xml.bind.annotation.XmlRootElement;
 @XmlRootElement
 @XmlAccessorType(XmlAccessType.FIELD)
 public class Member {
+	
+	public static final int GUEST_LEVEL     = 10;
+	public static final int REPORTER_LEVEL  = 20;
+	public static final int	DEVELOPER_LEVEL = 30;
+	public static final int	MASTER_LEVEL    = 40;
+	public static final int	OWNER_LEVEL     = 50;
 
 	private Integer accessLevel;
 	private Date createdAt;