Update gem dependencies

Gemfile.lock

@@ -1,18 +1,18 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.1.7)
+    activesupport (4.1.8)
       i18n (~> 0.6, >= 0.6.9)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
       thread_safe (~> 0.1)
       tzinfo (~> 1.1)
-    backports (3.6.3)
+    backports (3.6.4)
     better_errors (2.0.0)
       coderay (>= 1.0.0)
       erubis (>= 2.6.6)
       rack (>= 0.9.0)
-    browser (0.7.1)
+    browser (0.8.0)
     coderay (1.1.0)
     coffee-script (2.3.0)
       coffee-script-source
@@ -34,7 +34,7 @@ GEM
     json (1.8.1)
     method_source (0.8.2)
     mini_portile (0.6.1)
-    minitest (5.4.2)
+    minitest (5.4.3)
     multi_json (1.10.1)
     nokogiri (1.6.4.1)
       mini_portile (~> 0.6.0)
@@ -52,7 +52,7 @@ GEM
     rack-test (0.6.2)
       rack (>= 1.0)
     rr (1.1.2)
-    sass (3.4.7)
+    sass (3.4.8)
     sinatra (1.4.5)
       rack (~> 1.4)
       rack-protection (~> 1.4)