Add fixture for calling GET api.github.com/users/gaggle

Author: gaggle

test/fixtures/api.github.com/users/gaggle/GET.200.json

@@ -0,0 +1,5 @@
+{
+  "blog": "http://www.jonlauridsen.com",
+  "login": "gaggle",
+  "type": "User"
+}