Update gem dependencies

Gemfile.lock

@@ -1,14 +1,14 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.0.2)
+    activesupport (4.0.3)
       i18n (~> 0.6, >= 0.6.4)
       minitest (~> 4.2)
       multi_json (~> 1.3)
       thread_safe (~> 0.1)
       tzinfo (~> 0.3.37)
     atomic (1.1.14)
-    backports (3.5.0)
+    backports (3.6.0)
     better_errors (1.1.0)
       coderay (>= 1.0.0)
       erubis (>= 2.6.6)
@@ -20,16 +20,15 @@ GEM
     coffee-script-source (1.7.0)
     daemons (1.1.9)
     erubis (2.7.0)
-    ethon (0.6.2)
+    ethon (0.6.3)
       ffi (>= 1.3.0)
       mime-types (~> 1.18)
     eventmachine (1.0.3)
     execjs (2.0.2)
-    fattr (2.2.1)
     ffi (1.9.3)
     highline (1.6.20)
     hike (1.2.3)
-    html-pipeline (1.5.0)
+    html-pipeline (1.6.0)
       activesupport (>= 2)
       nokogiri (~> 1.4)
     i18n (0.6.9)
@@ -41,8 +40,7 @@ GEM
     multi_json (1.8.4)
     nokogiri (1.6.1)
       mini_portile (~> 0.5.0)
-    options (2.3.0)
+    options (2.3.2)
-      fattr
     progress_bar (1.0.0)
       highline (~> 1.6.1)
       options (~> 2.3.0)
@@ -69,7 +67,7 @@ GEM
       sinatra (~> 1.4.0)
       tilt (~> 1.3)
     slop (3.4.7)
-    sprockets (2.10.1)
+    sprockets (2.11.0)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)