Add support for squash_commit_sha in Merge Requests (#507)

* Add support for squash_commit_sha in MergeRequest
* Add support for references object in MergeRequest

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

@@ -28,6 +28,7 @@ public class MergeRequest {
     private Integer iid;
     private List<String> labels;
     private String mergeCommitSha;
+    private String squashCommitSha;
     private String mergeStatus;
     private Date mergedAt;
     private Participant mergedBy;
@@ -45,6 +46,7 @@ public class MergeRequest {
     private String targetBranch;
     private Integer targetProjectId;
     private TaskCompletionStatus taskCompletionStatus;
+    private References references;
     private TimeStats timeStats;
     private String title;
     private Date updatedAt;
@@ -207,6 +209,14 @@ public class MergeRequest {
         this.mergeCommitSha = mergeCommitSha;
     }
 
+    public String getSquashCommitSha() {
+        return squashCommitSha;
+    }
+
+    public void setSquashCommitSha(String squashCommitSha) {
+        this.squashCommitSha = squashCommitSha;
+    }
+
     public String getMergeStatus() {
         return mergeStatus;
     }
@@ -343,6 +353,14 @@ public class MergeRequest {
         this.taskCompletionStatus = taskCompletionStatus;
     }
 
+    public References getReferences() {
+        return references;
+    }
+
+    public void setReferences(References references) {
+        this.references = references;
+    }
+
     public TimeStats getTimeStats() {
         return timeStats;
     }

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

+package org.gitlab4j.api.models;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import org.gitlab4j.api.utils.JacksonJson;
+
+
+public class References {
+
+    @JsonProperty("short")
+    private String _short;
+    private String relative;
+    private String full;
+
+    public String getShort() {
+        return _short;
+    }
+
+    public void setShort(String _short) {
+        this._short = _short;
+    }
+
+    public String getRelative() {
+        return relative;
+    }
+
+    public void setRelative(String relative) {
+        this.relative = relative;
+    }
+
+    public String getFull() {
+        return full;
+    }
+
+    public void setFull(String full) {
+        this.full = full;
+    }
+
+    @Override
+    public String toString() {
+        return (JacksonJson.toJsonString(this));
+    }
+}

src/test/resources/org/gitlab4j/api/merge-request.json

@@ -11,6 +11,7 @@
     "created_at": "2016-12-03T17:23:34Z",
     "updated_at": "2016-12-03T17:23:34Z",
     "merged_at": "2016-12-03T17:23:34Z",
+    "squash_commit_sha": "37a1f246848c3dc2bb82964a183417e2e72fe1a7",
     "merged_by": {
         "id": 7,
         "name": "James Bond",
@@ -44,6 +45,11 @@
         "count":0,
         "completed_count":0
     },
+    "references": {
+        "short": "!1",
+        "relative": "!1",
+        "full": "my-group/my-project!1"
+    },
     "time_stats": {
         "time_estimate": 0,
         "total_time_spent": 0,