update to jekyll 0.12

Gemfile.lock

@@ -1,27 +1,29 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    albino (1.3.3)
-      posix-spawn (>= 0.3.6)
     classifier (1.3.3)
       fast-stemmer (>= 1.0.0)
     directory_watcher (1.4.1)
-    fast-stemmer (1.0.0)
-    jekyll (0.11.2)
-      albino (~> 1.3)
+    fast-stemmer (1.0.1)
+    jekyll (0.12.0)
       classifier (~> 1.3)
       directory_watcher (~> 1.1)
-      kramdown (~> 0.13)
+      kramdown (~> 0.13.4)
       liquid (~> 2.3)
       maruku (~> 0.5)
-    kramdown (0.13.4)
-    liquid (2.3.0)
-    maruku (0.6.0)
+      pygments.rb (~> 0.3.2)
+    kramdown (0.13.8)
+    liquid (2.4.1)
+    maruku (0.6.1)
       syntax (>= 1.0.0)
     posix-spawn (0.3.6)
-    rake (0.9.2)
+    pygments.rb (0.3.7)
+      posix-spawn (~> 0.3.6)
+      yajl-ruby (~> 1.1.0)
+    rake (10.0.3)
     rdiscount (1.6.8)
     syntax (1.0.0)
+    yajl-ruby (1.1.0)
 
 PLATFORMS
   ruby