Bump Ruby library versions

Gemfile.lock

@@ -10,7 +10,7 @@ GEM
     chunky_png (1.3.10)
     coderay (1.1.2)
     colored (1.2)
-    crass (1.0.3)
+    crass (1.0.4)
     cri (2.10.1)
       colored (~> 1.2)
     domain_name (0.5.20170404)
@@ -25,7 +25,7 @@ GEM
       faraday_middleware (~> 0.9)
       loofah (~> 2.0)
       sax-machine (~> 1.0)
-    ffi (1.9.18)
+    ffi (1.9.25)
     formatador (0.2.5)
     geokit (1.11.0)
     guard (2.14.2)
@@ -57,7 +57,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.1.1)
+    loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.12)
@@ -70,7 +70,7 @@ GEM
       cri (~> 2.3)
     naught (1.1.0)
     nenv (0.3.0)
-    nokogiri (1.8.2)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
@@ -141,4 +141,4 @@ DEPENDENCIES
   t (~> 2.10.0)
 
 BUNDLED WITH
-   1.13.7
+   1.16.1