Adding missing fields to User (#250)

* "followers_url" and "following_url" fields added to User

* minor

* Added type, hirable and public_repos

* minor: public_repos is now an Option

* fixing TestData (and defaulting some fields)

Author: mfirry

github4s/shared/src/main/scala/github4s/free/domain/User.scala

@@ -26,5 +26,10 @@ case class User(
     company: Option[String] = None,
     blog: Option[String] = None,
     location: Option[String] = None,
-    bio: Option[String] = None
-)
+    bio: Option[String] = None,
+    followers_url: Option[String] = None,
+    following_url: Option[String] = None,
+    `type`: String = "User", // I think this can be either "User" or "Organization"
+    hireable: Option[Boolean] = None,
+    public_repos: Option[Int] = None
+)