Shell out to bzip2 instead of using bzip2-ruby

Gemfile

@@ -9,7 +9,6 @@ gem 'confstruct'
 gem 'omniauth'
 gem 'omniauth-twitter'
 gem 'omniauth-github'
-gem 'bzip2-ruby'
 gem 'kaminari'
 gem 'airbrake'
 gem 'twitter-bootstrap-rails'

Gemfile.lock

@@ -36,7 +36,6 @@ GEM
     arel (3.0.0)
     awesome_print (0.4.0)
     builder (3.0.0)
-    bzip2-ruby (0.2.7)
     cane (1.0.0)
       tailor
     capistrano (2.11.2)
@@ -287,7 +286,6 @@ PLATFORMS
 DEPENDENCIES
   airbrake
   awesome_print
-  bzip2-ruby
   cane
   capistrano
   capybara

app/decorators/asciicast_decorator.rb

@@ -27,8 +27,14 @@ class AsciicastDecorator < ApplicationDecorator
   def stdout_timing_data
     saved_time = 0
 
-    if data = stdout_timing.read
-      data = Bzip2.uncompress(data).lines.map do |line|
+    if file = stdout_timing.file
+      f = IO.popen "bzip2 -d", "r+"
+      f.write file.read
+      f.close_write
+      lines = f.readlines
+      f.close
+
+      data = lines.map do |line|
         delay, n = line.split
         delay = delay.to_f