Update gem dependencies

Gemfile.lock

@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.0.3)
+    activesupport (4.0.4)
-      i18n (~> 0.6, >= 0.6.4)
+      i18n (~> 0.6, >= 0.6.9)
       minitest (~> 4.2)
       multi_json (~> 1.3)
       thread_safe (~> 0.1)
@@ -28,7 +28,7 @@ GEM
     ffi (1.9.3)
     highline (1.6.21)
     hike (1.2.3)
-    html-pipeline (1.6.0)
+    html-pipeline (1.7.0)
       activesupport (>= 2)
       nokogiri (~> 1.4)
     i18n (0.6.9)
@@ -53,10 +53,8 @@ GEM
       rack
     rack-test (0.6.2)
       rack (>= 1.0)
-    rake (10.1.1)
     rr (1.1.2)
-    sass (3.3.0)
+    sass (3.3.3)
-      rake
     sinatra (1.4.4)
       rack (~> 1.4)
       rack-protection (~> 1.4)
@@ -68,8 +66,8 @@ GEM
       rack-test
       sinatra (~> 1.4.0)
       tilt (~> 1.3)
-    slop (3.4.7)
+    slop (3.5.0)
-    sprockets (2.11.0)
+    sprockets (2.12.0)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)
@@ -86,8 +84,8 @@ GEM
     tilt (1.4.1)
     typhoeus (0.6.7)
       ethon (~> 0.6.2)
-    tzinfo (0.3.38)
+    tzinfo (0.3.39)
-    uglifier (2.4.0)
+    uglifier (2.5.0)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
     unix_utils (0.0.15)