Update gems

Fix #7796

Gemfile.lock

@@ -9,7 +9,7 @@ GEM
       highline (~> 1.6.11)
     commonjs (0.2.7)
     fast-stemmer (1.0.2)
-    ffi (1.9.6)
+    ffi (1.9.10)
     highline (1.6.21)
     jekyll (1.5.1)
       classifier (~> 1.3)
@@ -24,7 +24,7 @@ GEM
       toml (~> 0.1.0)
     less (2.5.1)
       commonjs (~> 0.2.7)
-    libv8 (3.16.14.7)
+    libv8 (3.16.14.13)
     liquid (2.5.5)
     listen (1.3.1)
       rb-fsevent (>= 0.9.3)
@@ -33,20 +33,20 @@ GEM
     maruku (0.7.0)
     parslet (1.5.0)
       blankslate (~> 2.0)
-    posix-spawn (0.3.9)
+    posix-spawn (0.3.11)
     pygments.rb (0.5.4)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.1.0)
-    rb-fsevent (0.9.4)
+    rb-fsevent (0.9.6)
     rb-inotify (0.9.5)
       ffi (>= 0.5.0)
-    rb-kqueue (0.2.3)
+    rb-kqueue (0.2.4)
       ffi (>= 0.5.0)
     redcarpet (2.3.0)
-    ref (1.0.5)
+    ref (2.0.0)
     safe_yaml (1.0.4)
-    sass (3.4.11)
-    therubyracer (0.12.1)
+    sass (3.4.19)
+    therubyracer (0.12.2)
       libv8 (~> 3.16.14.0)
       ref
     toml (0.1.2)
@@ -62,3 +62,6 @@ DEPENDENCIES
   safe_yaml (~> 1.0.4)
   sass (~> 3.0)
   therubyracer
+
+BUNDLED WITH
+   1.10.6