remove Crack gem usage

Gemfile

@@ -26,7 +26,6 @@ gem "system_timer", "~> 1.2.4", :platform => :ruby_18
 gem "will_paginate", "2.3.14"
 gem "geoip", "1.2.1"
 gem "geokit", "1.5.0"
-gem "crack", "0.1.4"
 gem "friendly_id", "2.2.5"
 gem "sax-machine", "0.0.14"
 gem "i18n", "0.3.7"

Gemfile.lock

@@ -44,7 +44,6 @@ GEM
       sass (~> 3.1)
     compass-rails (1.0.3)
       compass (>= 0.12.2, < 0.14)
-    crack (0.1.4)
     cucumber (1.1.0)
       builder (>= 2.1.2)
       diff-lcs (>= 1.1.2)
@@ -188,7 +187,6 @@ DEPENDENCIES
   aws-sdk (~> 1.5.0)
   capybara (~> 1.1.2)
   compass-rails (~> 1.0.3)
-  crack (= 0.1.4)
   cucumber (= 1.1.0)
   cucumber-rails2 (~> 0.3.2)
   database_cleaner (= 0.5.0)
@@ -235,3 +233,6 @@ DEPENDENCIES
   will_paginate (= 2.3.14)
   xml-simple (= 1.0.12)
   yfactorial-utility_scopes (= 0.2.2)
+
+BUNDLED WITH
+   1.16.0

app/controllers/prompts_controller.rb

@@ -58,7 +58,7 @@ def skip
     if skip = @prompt.post(:skip, :question_id => question_id,
                            :skip => get_object_request_options(params, :skip),
                            :next_prompt => get_next_prompt_options)
-      next_prompt = Crack::XML.parse(skip.body)['prompt']
+      next_prompt = Hash.from_xml(skip.body)['prompt']
 
       result = {
         :newleft           => CGI::escapeHTML(truncate(next_prompt['left_choice_text'], :length => 140, :omission => '…')),
@@ -107,7 +107,7 @@ def flag
                     :visitor_identifier => @survey_session.session_id,
                     :explanation => reason)
 
-    new_choice = Crack::XML.parse(c.body)['choice']
+    new_choice = Hash.from_xml(c.body)['choice']
     flag_choice_success = (c.code == "201" && new_choice['active'] == false)
     IdeaMailer.delay.deliver_flag_notification(@earl, new_choice["id"], new_choice["data"], reason, @photocracy)
 
@@ -122,7 +122,7 @@ def flag
     end
 
     if flag_choice_success && skip
-      next_prompt = Crack::XML.parse(skip.body)['prompt']
+      next_prompt = Hash.from_xml(skip.body)['prompt']
 
       result = {
         :newleft           => CGI::escapeHTML(truncate(next_prompt['left_choice_text'], :length => 140, :omission => '…')),