diff --git a/docs-book/Gemfile.lock b/docs-book/Gemfile.lock
index 98e4f1b..5392e7e 100644
--- a/docs-book/Gemfile.lock
+++ b/docs-book/Gemfile.lock
@@ -1,15 +1,15 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.10)
+    activesupport (4.2.11.3)
       i18n (~> 0.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     ansi (1.5.0)
-    backports (3.11.0)
+    backports (3.21.0)
     bookbindery (10.1.9)
       ansi (~> 1.4)
       css_parser
@@ -47,11 +47,11 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.9)
     contracts (0.13.0)
     css_parser (1.6.0)
       addressable
-    dotenv (2.2.1)
+    dotenv (2.7.6)
     elasticsearch (6.0.0)
       elasticsearch-api (= 6.0.0)
       elasticsearch-transport (= 6.0.0)
@@ -60,18 +60,18 @@ GEM
     elasticsearch-transport (6.0.0)
       faraday
       multi_json
-    em-websocket (0.5.1)
+    em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     erubis (2.7.0)
-    eventmachine (1.2.5)
+    eventmachine (1.2.7)
     excon (0.60.0)
-    execjs (2.7.0)
+    execjs (2.8.1)
     faraday (0.13.1)
       multipart-post (>= 1.2, < 3)
     fast_blank (1.0.0)
-    fastimage (2.1.1)
-    ffi (1.9.18)
+    fastimage (2.2.4)
+    ffi (1.15.1)
     fog-aws (0.7.6)
       fog-core (~> 1.27)
       fog-json (~> 1.0)
@@ -91,21 +91,21 @@ GEM
       sass (>= 3.2)
     formatador (0.2.5)
     git (1.2.9.1)
-    haml (5.0.4)
+    haml (5.2.1)
       temple (>= 0.8.0)
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    hashie (3.5.7)
+    hashie (3.6.0)
     http_parser.rb (0.6.0)
     i18n (0.7.0)
     ipaddress (0.8.3)
-    kramdown (1.16.2)
+    kramdown (1.17.0)
     libv8 (3.16.14.19)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    memoist (0.16.0)
+    memoist (0.16.2)
     middleman (4.1.10)
       coffee-script (~> 2.2)
       compass-import-once (= 1.0.5)
@@ -137,12 +137,12 @@ GEM
       memoist (~> 0.14)
       padrino-helpers (~> 0.13.0)
       parallel
-      rack (~> 1.5.4)
+      rack (>= 1.4.5, < 2.0)
       sass (>= 3.4)
       servolux
       tilt (~> 1.4.1)
       uglifier (~> 3.0)
-    middleman-livereload (3.4.6)
+    middleman-livereload (3.4.7)
       em-websocket (~> 0.5.1)
       middleman-core (>= 3.3)
       rack-livereload (~> 0.3.15)
@@ -152,44 +152,44 @@ GEM
     middleman-syntax (2.1.0)
       middleman-core (>= 3.2)
       rouge (~> 1.0)
-    mini_portile2 (2.0.0)
-    minitest (5.11.1)
+    mini_portile2 (2.3.0)
+    minitest (5.14.4)
     multi_json (1.13.0)
     multipart-post (2.0.0)
-    nokogiri (1.6.7.2)
-      mini_portile2 (~> 2.0.0.rc2)
+    nokogiri (1.8.5)
+      mini_portile2 (~> 2.3.0)
     padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.4)
       tilt (>= 1.4.1, < 3)
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.12.1)
-    public_suffix (3.0.1)
+    parallel (1.20.1)
+    public_suffix (4.0.6)
     puma (3.11.0)
-    rack (1.6.8)
-    rack-livereload (0.3.16)
+    rack (1.6.13)
+    rack-livereload (0.3.17)
       rack
     rack-rewrite (1.5.1)
-    rb-fsevent (0.10.2)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-fsevent (0.11.0)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
     redcarpet (3.2.3)
     ref (2.0.0)
     rouge (1.11.1)
     sass (3.4.25)
     servolux (0.13.0)
-    sprockets (3.7.1)
+    sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    temple (0.8.0)
+    temple (0.8.2)
     therubyracer (0.12.3)
       libv8 (~> 3.16.14.15)
       ref
     thor (0.19.1)
     thread_safe (0.3.6)
     tilt (1.4.1)
-    tzinfo (1.2.4)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)