cleanup dependencies

lib/fog.rb

@@ -2,6 +2,7 @@ require 'rubygems'
 require 'base64'
 require 'cgi'
 require 'digest/md5'
+require 'excon'
 require 'hmac-sha1'
 require 'hmac-sha2'
 require 'json'

lib/fog/connection.rb

@@ -1,9 +1,3 @@
-require 'rubygems'
-require 'excon'
-
-require "fog/errors"
-require "fog/response"
-
 unless Fog.mocking?
 
   module Fog