Initial check-in.

src/test/resources/org/gitlab4j/api/project-users.json

+[
+  {
+    "id": 1,
+    "username": "john_smith",
+    "name": "John Smith",
+    "state": "active",
+    "avatar_url": "http://localhost:3000/uploads/user/avatar/1/cd8.jpeg",
+    "web_url": "http://localhost:3000/john_smith"
+  },
+  {
+    "id": 2,
+    "username": "jack_smith",
+    "name": "Jack Smith",
+    "state": "blocked",
+    "avatar_url": "http://gravatar.com/../e32131cd8.jpeg",
+    "web_url": "http://localhost:3000/jack_smith"
+  }
+]
\ No newline at end of file