Added a method to fetch the currently logged in user.

src/main/java/org/gitlab/api/GitlabAPI.java

@@ -252,6 +252,7 @@ public class GitlabAPI {
     }
 
     // List all users
+    // GET /users
     public List<GitlabUser> getAllUsers() throws IOException {
         String tailUrl = GitlabUser.URL;
 
@@ -268,4 +269,12 @@ public class GitlabAPI {
 
         return results;
     }
+
+    // Gets currently authenticated user
+    // GET /user
+    public GitlabUser getLoggedInUser() throws IOException {
+        String tailUrl = "/user";
+        GitlabUser user = retrieve().to(tailUrl, GitlabUser.class);
+        return user;
+    }
 }