Update Middleman to version 3.3.9

Gemfile.lock

@@ -9,19 +9,19 @@ GEM
       tzinfo (~> 1.1)
     celluloid (0.16.0)
       timers (~> 4.0.0)
-    chunky_png (1.3.3)
+    chunky_png (1.3.4)
     coffee-script (2.3.0)
       coffee-script-source
       execjs
-    coffee-script-source (1.8.0)
-    compass (1.0.1)
+    coffee-script-source (1.9.1)
+    compass (1.0.3)
       chunky_png (~> 1.2)
-      compass-core (~> 1.0.1)
+      compass-core (~> 1.0.2)
       compass-import-once (~> 1.0.5)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
       sass (>= 3.3.13, < 3.5)
-    compass-core (1.0.1)
+    compass-core (1.0.3)
       multi_json (~> 1.0)
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
@@ -31,7 +31,7 @@ GEM
       http_parser.rb (~> 0.6.0)
     erubis (2.7.0)
     eventmachine (1.0.4)
-    execjs (2.2.2)
+    execjs (2.3.0)
     ffi (1.9.6)
     haml (4.0.6)
       tilt
@@ -40,31 +40,31 @@ GEM
     hooks (0.4.0)
       uber (~> 0.0.4)
     http_parser.rb (0.6.0)
-    i18n (0.6.11)
+    i18n (0.7.0)
     json (1.8.2)
     kramdown (1.5.0)
     libv8 (3.16.14.7)
     listen (2.8.5)
       celluloid (>= 0.15.2)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
-    middleman (3.3.7)
+    middleman (3.3.9)
       coffee-script (~> 2.2)
       compass (>= 1.0.0, < 2.0.0)
       compass-import-once (= 1.0.5)
       execjs (~> 2.0)
       haml (>= 4.0.5)
       kramdown (~> 1.2)
-      middleman-core (= 3.3.7)
+      middleman-core (= 3.3.9)
       middleman-sprockets (>= 3.1.2)
       sass (>= 3.4.0, < 4.0)
       uglifier (~> 2.5)
-    middleman-core (3.3.7)
+    middleman-core (3.3.9)
       activesupport (~> 4.1.0)
       bundler (~> 1.1)
       erubis
       hooks (~> 0.3)
-      i18n (~> 0.6.9)
+      i18n (~> 0.7.0)
       listen (>= 2.7.9, < 3.0)
       padrino-helpers (~> 0.12.3)
       rack (>= 1.4.5, < 2.0)
@@ -106,7 +106,7 @@ GEM
     ref (1.0.5)
     rouge (1.8.0)
     ruby18_source_location (0.2)
-    sass (3.4.9)
+    sass (3.4.12)
     sprockets (2.12.3)
       hike (~> 1.2)
       multi_json (~> 1.0)