Upgraded [arel, concurrent-ruby, nokogiri, rails-dom-testing] gems

Gemfile.lock

@@ -38,7 +38,7 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.5.0)
       public_suffix (~> 2.0, >= 2.0.2)
-    arel (6.0.3)
+    arel (6.0.4)
     aruba (0.14.2)
       childprocess (~> 0.5.6)
       contracts (~> 0.9)
@@ -76,7 +76,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.3)
+    concurrent-ruby (1.0.4)
     contracts (0.14.0)
     crack (0.3.1)
     cucumber (2.4.0)
@@ -175,7 +175,7 @@ GEM
     multi_test (0.1.2)
     mysql2 (0.4.5)
     nenv (0.3.0)
-    nokogiri (1.6.8.1)
+    nokogiri (1.7.0)
       mini_portile2 (~> 2.1.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
@@ -214,9 +214,9 @@ GEM
       sprockets-rails
     rails-deprecated_sanitizer (1.0.3)
       activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (1.0.7)
+    rails-dom-testing (1.0.8)
       activesupport (>= 4.2.0.beta, < 5.0)
-      nokogiri (~> 1.6.0)
+      nokogiri (~> 1.6)
       rails-deprecated_sanitizer (>= 1.0.1)
     rails-html-sanitizer (1.0.3)
       loofah (~> 2.0)