Mods to support IssuesApi (#69)

src/test/java/org/gitlab4j/api/TestNotesApi.java

@@ -84,7 +84,7 @@ public class TestNotesApi {
         Project project = gitLabApi.getProjectApi().getProject(TEST_NAMESPACE, TEST_PROJECT_NAME);
         assertNotNull(project);
 
-        for (Issue issue : gitLabApi.getProjectApi().getIssues(project.getId())) {
+        for (Issue issue : gitLabApi.getIssuesApi().getIssues(project.getId())) {
             List<Note> notes = gitLabApi.getNotesApi().getNotes(project.getId(), issue.getIid());
             assertNotNull(notes);
             // This requires some issues in the project 

src/test/resources/org/gitlab4j/api/issue.json

@@ -35,5 +35,11 @@
    "subscribed": false,
    "user_notes_count": 1,
    "web_url": "http://example.com/example/example/issues/1",
-   "confidential": false
+   "confidential": false,
+   "time_stats": {
+      "time_estimate": 12600,
+      "total_time_spent": 0,
+      "human_time_estimate": "3h30m",
+      "human_total_time_spent": "0m"
+   }
 }
\ No newline at end of file