[rackspace] more universally handle json parsing stuff for rackspace

lib/fog/rackspace/files.rb

@@ -122,7 +122,7 @@ module Fog
             :host     => @storage_host,
             :path     => "#{@storage_path}/#{params[:path]}",
           }), &block)
-          if !response.body.empty? && parse_json
+          if !response.body.empty? && parse_json && response.headers['Content-Type'] == 'application/json'
             response.body = JSON.parse(response.body)
           end
           response

lib/fog/rackspace/requests/files/put_container.rb

@@ -9,11 +9,11 @@ module Fog
         # * name<~String> - Name for container, should be < 256 bytes and must not contain '/'
         #
         def put_container(name)
-          response = storage_request({
+          response = storage_request(
             :expects  => [201, 202],
             :method   => 'PUT',
             :path     => CGI.escape(name)
-          }, false)
+          )
           response
         end