Update gem dependencies

Author: Thibaut

Gemfile.lock

@@ -11,7 +11,7 @@ GEM
     better_errors (1.1.0)
       coderay (>= 1.0.0)
       erubis (>= 2.6.6)
-    browser (0.4.1)
+    browser (0.6.0)
     coderay (1.1.0)
     coffee-script (2.2.0)
       coffee-script-source
@@ -22,7 +22,7 @@ GEM
     ethon (0.7.0)
       ffi (>= 1.3.0)
     eventmachine (1.0.3)
-    execjs (2.0.2)
+    execjs (2.2.0)
     ffi (1.9.3)
     highline (1.6.21)
     hike (1.2.3)
@@ -34,11 +34,11 @@ GEM
     method_source (0.8.2)
     mini_portile (0.6.0)
     minitest (5.3.4)
-    multi_json (1.10.0)
+    multi_json (1.10.1)
     nokogiri (1.6.2.1)
       mini_portile (= 0.6.0)
     options (2.3.2)
-    progress_bar (1.0.0)
+    progress_bar (1.0.2)
       highline (~> 1.6.1)
       options (~> 2.3.0)
     pry (0.9.12.6)
@@ -51,7 +51,7 @@ GEM
     rack-test (0.6.2)
       rack (>= 1.0)
     rr (1.1.2)
-    sass (3.3.7)
+    sass (3.3.8)
     sinatra (1.4.5)
       rack (~> 1.4)
       rack-protection (~> 1.4)
@@ -76,17 +76,17 @@ GEM
       eventmachine (>= 1.0.0)
       rack (>= 1.0.0)
     thor (0.19.1)
-    thread_safe (0.3.3)
+    thread_safe (0.3.4)
     tilt (1.4.1)
     typhoeus (0.6.8)
       ethon (>= 0.7.0)
-    tzinfo (1.1.0)
+    tzinfo (1.2.1)
       thread_safe (~> 0.1)
-    uglifier (2.5.0)
+    uglifier (2.5.1)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
     unix_utils (0.0.15)
-    yajl-ruby (1.2.0)
+    yajl-ruby (1.2.1)
 
 PLATFORMS
   ruby