Revert "bundle update"

This reverts commit c85ae8d.

rack-jekyll 0.4.4 was not properly released to RubyGems.

Author: stomar

Gemfile.lock

@@ -54,7 +54,7 @@ GEM
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.2.0)
     rack (1.6.4)
-    rack-jekyll (0.4.4)
+    rack-jekyll (0.4.2)
       jekyll (>= 1.3)
       listen (>= 1.3)
       rack (~> 1.5)