Update gem dependencies

Gemfile.lock

@@ -7,12 +7,12 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.1)
       tzinfo (~> 1.1)
-    backports (3.6.0)
+    backports (3.6.3)
     better_errors (2.0.0)
       coderay (>= 1.0.0)
       erubis (>= 2.6.6)
       rack (>= 0.9.0)
-    browser (0.6.0)
+    browser (0.7.0)
     coderay (1.1.0)
     coffee-script (2.3.0)
       coffee-script-source
@@ -24,17 +24,17 @@ GEM
       ffi (>= 1.3.0)
     eventmachine (1.0.3)
     execjs (2.2.1)
-    ffi (1.9.3)
+    ffi (1.9.6)
     highline (1.6.21)
     hike (1.2.3)
-    html-pipeline (1.10.0)
+    html-pipeline (1.11.0)
       activesupport (>= 2)
       nokogiri (~> 1.4)
     i18n (0.6.11)
     json (1.8.1)
     method_source (0.8.2)
     mini_portile (0.6.0)
-    minitest (5.4.1)
+    minitest (5.4.2)
     multi_json (1.10.1)
     nokogiri (1.6.3.1)
       mini_portile (= 0.6.0)
@@ -52,7 +52,7 @@ GEM
     rack-test (0.6.2)
       rack (>= 1.0)
     rr (1.1.2)
-    sass (3.4.4)
+    sass (3.4.5)
     sinatra (1.4.5)
       rack (~> 1.4)
       rack-protection (~> 1.4)
@@ -72,10 +72,10 @@ GEM
       tilt (~> 1.1, != 1.3.0)
     sprockets-helpers (1.1.0)
       sprockets (~> 2.0)
-    thin (1.6.2)
-      daemons (>= 1.0.9)
-      eventmachine (>= 1.0.0)
-      rack (>= 1.0.0)
+    thin (1.6.3)
+      daemons (~> 1.0, >= 1.0.9)
+      eventmachine (~> 1.0)
+      rack (~> 1.0)
     thor (0.19.1)
     thread_safe (0.3.4)
     tilt (1.4.1)