add script to create an initial admin user

Gemfile.lock

@@ -106,6 +106,7 @@ GEM
     haml (4.0.7)
       tilt
     hashie (3.4.6)
+    highline (1.7.8)
     httparty (0.14.0)
       multi_xml (>= 0.5.2)
     i18n (0.8.1)
@@ -230,6 +231,7 @@ DEPENDENCIES
   gelf
   haml
   hashie
+  highline
   jquery-rails
   jwt
   kaminari