Update middleman gem

Gemfile.lock

 GIT
   remote: https://github.com/vmg/redcarpet.git
-  revision: a072e16f547883518bd22bd0df0f4bfa2d4a149b
+  revision: 52c5fa3c5753d2125e827f235cdf4cb730484902
   specs:
     redcarpet (3.0.0)
 
@@ -32,22 +32,22 @@ GEM
     hike (1.2.3)
     http_parser.rb (0.5.3)
     i18n (0.6.9)
-    kramdown (1.2.0)
+    kramdown (1.3.0)
     listen (1.3.1)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
       rb-kqueue (>= 0.2)
-    middleman (3.2.0)
+    middleman (3.2.1)
       coffee-script (~> 2.2.0)
       compass (>= 0.12.2)
       execjs (~> 1.4.0)
       haml (>= 3.1.6)
       kramdown (~> 1.2)
-      middleman-core (= 3.2.0)
+      middleman-core (= 3.2.1)
       middleman-sprockets (>= 3.1.2)
       sass (>= 3.1.20)
       uglifier (~> 2.1.0)
-    middleman-core (3.2.0)
+    middleman-core (3.2.1)
       activesupport (~> 3.2.6)
       bundler (~> 1.1)
       i18n (~> 0.6.1)
@@ -55,7 +55,7 @@ GEM
       rack (>= 1.4.5)
       rack-test (~> 0.6.1)
       thor (>= 0.15.2, < 2.0)
-      tilt (~> 1.3.6)
+      tilt (~> 1.4.1)
     middleman-gh-pages (0.0.2)
       rake (> 0.9.3)
     middleman-livereload (3.1.0)
@@ -79,7 +79,7 @@ GEM
       rack (>= 1.0)
     rake (10.1.0)
     rb-fsevent (0.9.3)
-    rb-inotify (0.9.2)
+    rb-inotify (0.9.3)
       ffi (>= 0.5.0)
     rb-kqueue (0.2.0)
       ffi (>= 0.5.0)
@@ -98,7 +98,7 @@ GEM
       sprockets (~> 2.0)
       tilt (~> 1.1)
     thor (0.18.1)
-    tilt (1.3.7)
+    tilt (1.4.1)
     uglifier (2.1.2)
       execjs (>= 0.3.0)
       multi_json (~> 1.0, >= 1.0.2)