Uses latest bookbindery

- Upgrades to version 10.1.12

Solves https://github.com/greenplum-db/gpdb/issues/4361

gpdb-doc/book/Gemfile.lock

 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.8)
+    activesupport (4.2.10)
       i18n (~> 0.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
     ansi (1.5.0)
-    backports (3.8.0)
-    bookbindery (10.1.4)
+    backports (3.11.0)
+    bookbindery (10.1.12)
       ansi (~> 1.4)
       css_parser
       elasticsearch
@@ -21,8 +21,8 @@ GEM
       middleman-compass
       middleman-livereload
       middleman-sprockets
-      middleman-syntax
-      nokogiri (= 1.6.7.2)
+      middleman-syntax (= 2.1.0)
+      nokogiri (= 1.8.1)
       puma
       rack-rewrite
       redcarpet (~> 3.2.3)
@@ -49,37 +49,37 @@ GEM
       sass (>= 3.2, < 3.5)
     concurrent-ruby (1.0.5)
     contracts (0.13.0)
-    css_parser (1.5.0)
+    css_parser (1.6.0)
       addressable
     dotenv (2.2.1)
-    elasticsearch (5.0.4)
-      elasticsearch-api (= 5.0.4)
-      elasticsearch-transport (= 5.0.4)
-    elasticsearch-api (5.0.4)
+    elasticsearch (6.0.0)
+      elasticsearch-api (= 6.0.0)
+      elasticsearch-transport (= 6.0.0)
+    elasticsearch-api (6.0.0)
       multi_json
-    elasticsearch-transport (5.0.4)
+    elasticsearch-transport (6.0.0)
       faraday
       multi_json
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     erubis (2.7.0)
-    eventmachine (1.2.3)
-    excon (0.55.0)
+    eventmachine (1.2.5)
+    excon (0.60.0)
     execjs (2.7.0)
-    faraday (0.12.1)
+    faraday (0.13.1)
       multipart-post (>= 1.2, < 3)
     fast_blank (1.0.0)
-    fastimage (2.1.0)
+    fastimage (2.1.1)
     ffi (1.9.18)
     fog-aws (0.7.6)
       fog-core (~> 1.27)
       fog-json (~> 1.0)
       fog-xml (~> 0.1)
       ipaddress (~> 0.8)
-    fog-core (1.44.1)
+    fog-core (1.45.0)
       builder
-      excon (~> 0.49)
+      excon (~> 0.58)
       formatador (~> 0.2)
     fog-json (1.0.2)
       fog-core (~> 1.0)
@@ -91,21 +91,21 @@ GEM
       sass (>= 3.2)
     formatador (0.2.5)
     git (1.2.9.1)
-    haml (5.0.1)
+    haml (5.0.4)
       temple (>= 0.8.0)
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    hashie (3.5.5)
+    hashie (3.5.7)
     http_parser.rb (0.6.0)
     i18n (0.7.0)
     ipaddress (0.8.3)
-    kramdown (1.13.2)
+    kramdown (1.16.2)
     libv8 (3.16.14.7)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    memoist (0.15.0)
+    memoist (0.16.0)
     middleman (4.1.10)
       coffee-script (~> 2.2)
       compass-import-once (= 1.0.5)
@@ -146,38 +146,38 @@ GEM
       em-websocket (~> 0.5.1)
       middleman-core (>= 3.3)
       rack-livereload (~> 0.3.15)
-    middleman-sprockets (4.1.0)
+    middleman-sprockets (4.1.1)
       middleman-core (~> 4.0)
       sprockets (>= 3.0)
-    middleman-syntax (3.0.0)
+    middleman-syntax (2.1.0)
       middleman-core (>= 3.2)
-      rouge (~> 2.0)
-    mini_portile2 (2.0.0)
-    minitest (5.10.1)
-    multi_json (1.12.1)
+      rouge (~> 1.0)
+    mini_portile2 (2.3.0)
+    minitest (5.11.1)
+    multi_json (1.13.1)
     multipart-post (2.0.0)
-    nokogiri (1.6.7.2)
-      mini_portile2 (~> 2.0.0.rc2)
-    padrino-helpers (0.13.3.3)
+    nokogiri (1.8.1)
+      mini_portile2 (~> 2.3.0)
+    padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
-      padrino-support (= 0.13.3.3)
+      padrino-support (= 0.13.3.4)
       tilt (>= 1.4.1, < 3)
-    padrino-support (0.13.3.3)
+    padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.11.1)
-    public_suffix (2.0.5)
-    puma (3.8.2)
-    rack (1.6.5)
+    parallel (1.12.1)
+    public_suffix (3.0.1)
+    puma (3.11.1)
+    rack (1.6.8)
     rack-livereload (0.3.16)
       rack
     rack-rewrite (1.5.1)
-    rb-fsevent (0.9.8)
-    rb-inotify (0.9.8)
-      ffi (>= 0.5.0)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
     redcarpet (3.2.3)
     ref (2.0.0)
-    rouge (2.0.7)
-    sass (3.4.23)
+    rouge (1.11.1)
+    sass (3.4.25)
     servolux (0.13.0)
     sprockets (3.7.1)
       concurrent-ruby (~> 1.0)
@@ -189,7 +189,7 @@ GEM
     thor (0.19.1)
     thread_safe (0.3.6)
     tilt (1.4.1)
-    tzinfo (1.2.3)
+    tzinfo (1.2.4)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
@@ -202,4 +202,4 @@ DEPENDENCIES
   libv8 (= 3.16.14.7)
 
 BUNDLED WITH
-   1.13.7
+   1.16.1