Bump nokogiri

Gemfile

@@ -134,7 +134,7 @@ gem "leaflet-rails",       "1.1.0"
 
 # Parsing
 
-gem "nokogiri",          "1.7.2"
+gem "nokogiri",          "1.8.0"
 gem "open_graph_reader", "0.6.2" # also update User-Agent in features/support/webmock.rb
 gem "redcarpet",         "3.4.0"
 gem "ruby-oembed",       "0.10.1"

Gemfile.lock

@@ -366,7 +366,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
     mini_magick (4.8.0)
-    mini_portile2 (2.1.0)
+    mini_portile2 (2.2.0)
     minitest (5.10.3)
     mobile-fu (1.3.1)
       rack-mobile-detect
@@ -379,8 +379,8 @@ GEM
     naught (1.1.0)
     nenv (0.3.0)
     nio4r (2.0.0)
-    nokogiri (1.7.2)
-      mini_portile2 (~> 2.1.0)
+    nokogiri (1.8.0)
+      mini_portile2 (~> 2.2.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -811,7 +811,7 @@ DEPENDENCIES
   minitest
   mobile-fu (= 1.3.1)
   mysql2 (= 0.4.8)
-  nokogiri (= 1.7.2)
+  nokogiri (= 1.8.0)
   omniauth (= 1.4.2)
   omniauth-facebook (= 4.0.0)
   omniauth-tumblr (= 1.2)