gitlab4j#1023 Add Field Iteration to Issue.

+ Iteration Class
+ Getter and Setter for Iteration field

Author: KoCoder

src/main/java/org/gitlab4j/api/models/AbstractIssue.java

@@ -78,6 +78,7 @@ public String toString() {
     private Integer mergeRequestsCount;
     private Boolean hasTasks;
     private String taskStatus;
+    private Iteration iteration;
     private TaskCompletionStatus taskCompletionStatus;
 
     public Assignee getAssignee() {
@@ -325,7 +326,15 @@ public void setTaskStatus(String taskStatus) {
         this.taskStatus = taskStatus;
     }
 
-    public TaskCompletionStatus getTaskCompletionStatus() {
+    public Iteration getIteration() {
+		return iteration;
+	}
+
+	public void setIteration(Iteration iteration) {
+		this.iteration = iteration;
+	}
+
+	public TaskCompletionStatus getTaskCompletionStatus() {
         return taskCompletionStatus;
     }
 

src/main/java/org/gitlab4j/api/models/Iteration.java

@@ -0,0 +1,116 @@
+package org.gitlab4j.api.models;
+
+import java.util.Date;
+
+import org.gitlab4j.api.utils.JacksonJsonEnumHelper;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonValue;
+
+public class Iteration {
+	public enum IterationState {
+		Opened, Upcomming, Current, Closed;
+
+		private static JacksonJsonEnumHelper<IterationState> enumHelper = new JacksonJsonEnumHelper<>(IterationState.class, true, true);
+
+        @JsonCreator
+        public static IterationState forValue(String value) {
+            return enumHelper.forValue(value);
+        }
+
+        @JsonValue
+        public String toValue() {
+            return (enumHelper.toString(this));
+        }
+
+        @Override
+        public String toString() {
+            return (enumHelper.toString(this));
+        }
+	}
+
+	private Long id;
+	private Long iid;
+	private Long sequence;
+	private Long groupId;
+	private String title;
+	private String descripion;
+	private IterationState state;
+	private Date createdAt;
+	private Date updatedAt;
+	private Date startDate;
+	private Date dueDate;
+	private String webUrl;
+	public Long getId() {
+		return id;
+	}
+	public void setId(Long id) {
+		this.id = id;
+	}
+	public Long getIid() {
+		return iid;
+	}
+	public void setIid(Long iid) {
+		this.iid = iid;
+	}
+	public Long getSequence() {
+		return sequence;
+	}
+	public void setSequence(Long sequence) {
+		this.sequence = sequence;
+	}
+	public Long getGroupId() {
+		return groupId;
+	}
+	public void setGroupId(Long groupId) {
+		this.groupId = groupId;
+	}
+	public String getTitle() {
+		return title;
+	}
+	public void setTitle(String title) {
+		this.title = title;
+	}
+	public String getDescripion() {
+		return descripion;
+	}
+	public void setDescripion(String descripion) {
+		this.descripion = descripion;
+	}
+	public IterationState getState() {
+		return state;
+	}
+	public void setState(IterationState state) {
+		this.state = state;
+	}
+	public Date getCreatedAt() {
+		return createdAt;
+	}
+	public void setCreatedAt(Date createdAt) {
+		this.createdAt = createdAt;
+	}
+	public Date getUpdatedAt() {
+		return updatedAt;
+	}
+	public void setUpdatedAt(Date updatedAt) {
+		this.updatedAt = updatedAt;
+	}
+	public Date getStartDate() {
+		return startDate;
+	}
+	public void setStartDate(Date startDate) {
+		this.startDate = startDate;
+	}
+	public Date getDueDate() {
+		return dueDate;
+	}
+	public void setDueDate(Date dueDate) {
+		this.dueDate = dueDate;
+	}
+	public String getWebUrl() {
+		return webUrl;
+	}
+	public void setWebUrl(String webUrl) {
+		this.webUrl = webUrl;
+	}
+}