Update gem dependencies

Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.1)
+    activesupport (4.2.3)
       i18n (~> 0.7)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
@@ -18,15 +18,14 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.9.1.1)
-    daemons (1.2.2)
+    daemons (1.2.3)
     erubis (2.7.0)
-    ethon (0.7.3)
+    ethon (0.7.4)
       ffi (>= 1.3.0)
     eventmachine (1.0.7)
     execjs (2.5.2)
-    ffi (1.9.8)
+    ffi (1.9.10)
     highline (1.6.21)
-    hike (1.2.3)
     html-pipeline (1.11.0)
       activesupport (>= 2)
       nokogiri (~> 1.4)
@@ -35,7 +34,7 @@ GEM
     method_source (0.8.2)
     mini_portile (0.6.2)
     minitest (5.7.0)
-    multi_json (1.11.0)
+    multi_json (1.11.2)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
     options (2.3.2)
@@ -46,19 +45,19 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.6.1)
+    rack (1.6.4)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)
       rack (>= 1.0)
     rake (10.4.2)
     rr (1.1.2)
-    sass (3.4.14)
+    sass (3.4.15)
     sinatra (1.4.6)
       rack (~> 1.4)
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
-    sinatra-contrib (1.4.4)
+    sinatra-contrib (1.4.6)
       backports (>= 2.0)
       multi_json
       rack-protection
@@ -66,22 +65,19 @@ GEM
       sinatra (~> 1.4.0)
       tilt (>= 1.3, < 3)
     slop (3.6.0)
-    sprockets (2.12.3)
-      hike (~> 1.2)
-      multi_json (~> 1.0)
+    sprockets (3.2.0)
       rack (~> 1.0)
-      tilt (~> 1.1, != 1.3.0)
-    sprockets-helpers (1.1.0)
-      sprockets (~> 2.0)
+    sprockets-helpers (1.2.1)
+      sprockets (>= 2.2)
     thin (1.6.3)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0)
       rack (~> 1.0)
     thor (0.19.1)
     thread_safe (0.3.5)
-    tilt (1.4.1)
-    typhoeus (0.7.1)
-      ethon (>= 0.7.1)
+    tilt (2.0.1)
+    typhoeus (0.7.2)
+      ethon (>= 0.7.4)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
     uglifier (2.7.1)