Update gem dependencies

Gemfile.lock

@@ -12,18 +12,18 @@ GEM
       coderay (>= 1.0.0)
       erubis (>= 2.6.6)
       rack (>= 0.9.0)
-    browser (2.2.0)
+    browser (2.3.0)
     coderay (1.1.1)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
-    coffee-script-source (1.10.0)
+    coffee-script-source (1.11.1)
     concurrent-ruby (1.0.2)
     daemons (1.2.4)
     erubis (2.7.0)
     ethon (0.9.1)
       ffi (>= 1.3.0)
-    eventmachine (1.2.0.1)
+    eventmachine (1.2.1)
     execjs (2.7.0)
     ffi (1.9.14)
     highline (1.7.8)
@@ -36,19 +36,17 @@ GEM
     mini_portile2 (2.1.0)
     minitest (5.9.1)
     multi_json (1.12.1)
-    nokogiri (1.6.8)
+    nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
-      pkg-config (~> 1.1.7)
     options (2.3.2)
-    pkg-config (1.1.7)
-    progress_bar (1.0.5)
+    progress_bar (1.1.0)
       highline (~> 1.6)
       options (~> 2.3.0)
     pry (0.10.4)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.6.4)
+    rack (1.6.5)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)
@@ -77,7 +75,7 @@ GEM
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
-    thor (0.19.1)
+    thor (0.19.3)
     thread_safe (0.3.5)
     tilt (2.0.5)
     tty-pager (0.4.0)
@@ -90,13 +88,13 @@ GEM
       ethon (>= 0.9.0)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
-    uglifier (3.0.2)
+    uglifier (3.0.3)
       execjs (>= 0.3.0, < 3)
     unicode_utils (1.4.0)
     unix_utils (0.0.15)
     verse (0.4.0)
       unicode_utils (~> 1.4.0)
-    yajl-ruby (1.2.1)
+    yajl-ruby (1.3.0)
 
 PLATFORMS
   ruby