Added getIssues with page and per_page parameters

getIssues() unless parameter returns only first page of issues.

Override this method with page and per_page parameters,
provides a way to read all issues page by page.

Signed-off-by: Matteo Facchinetti <matteo.facchinetti@sirius-es.it>

src/main/java/org/gitlab4j/api/ProjectApi.java

@@ -682,7 +682,7 @@ public class ProjectApi extends AbstractApi {
     }
 
     /**
-     * Get a list of project's issues.
+     * Get a list of project's issues. Only returns the first page
      *
      * GET /projects/:id/issues
      *
@@ -695,4 +695,24 @@ public class ProjectApi extends AbstractApi {
         return (response.readEntity(new GenericType<List<Issue>>() {
         }));
     }
+
+    /**
+     * Get a list of project's issues using the specified page and per page settings.
+     *
+     * GET /projects/:id/issues
+     *
+     * @param page the page to get
+     * @param perPage the number of issues per page
+     * @return the list of issues in the specified range
+     * @throws GitLabApiException if any exception occurs
+     */
+    public List<Issue> getIssues(Integer projectId, int page, int perPage) throws GitLabApiException {
+
+        GitLabApiForm formData = new GitLabApiForm()
+                .withParam("page", page, false)
+                .withParam("per_page", perPage, false);
+        Response response = get(Response.Status.OK, formData.asMap(), "projects", projectId, "issues");
+        return (response.readEntity(new GenericType<List<Issue>>() {
+        }));
+    }
 }