Fix build, update middleman

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 # Middleman
-gem 'middleman', '~>4.0.0'
+gem 'middleman', '~>4.1.0'
 gem 'middleman-syntax', '~> 3.0.0'
 gem 'middleman-autoprefixer', '~> 2.7.0'
 gem "middleman-sprockets", "~> 4.0.0"

Gemfile.lock

@@ -11,118 +11,107 @@ GEM
     autoprefixer-rails (6.4.1)
       execjs
     backports (3.6.8)
-    capybara (2.5.0)
-      mime-types (>= 1.16)
-      nokogiri (>= 1.3.3)
-      rack (>= 1.0.0)
-      rack-test (>= 0.5.4)
-      xpath (~> 2.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.10.0)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (0.9.2)
-    contracts (0.12.0)
+    concurrent-ruby (1.0.2)
+    contracts (0.13.0)
+    dotenv (2.1.1)
     erubis (2.7.0)
     execjs (2.7.0)
-    fastimage (1.8.1)
-      addressable (~> 2.3, >= 2.3.5)
+    fast_blank (1.0.0)
+    fastimage (2.0.0)
+      addressable (~> 2)
     ffi (1.9.14)
     haml (4.0.7)
       tilt
-    hamster (2.0.0)
-      concurrent-ruby (~> 0.8)
+    hamster (3.0.0)
+      concurrent-ruby (~> 1.0)
     hashie (3.4.4)
     i18n (0.7.0)
     json (1.8.3)
     kramdown (1.12.0)
-    listen (3.1.5)
+    listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-      ruby_dep (~> 1.2)
-    middleman (4.0.0)
+    memoist (0.15.0)
+    middleman (4.1.10)
       coffee-script (~> 2.2)
       compass-import-once (= 1.0.5)
       haml (>= 4.0.5)
       kramdown (~> 1.2)
-      middleman-cli (= 4.0.0)
-      middleman-core (= 4.0.0)
+      middleman-cli (= 4.1.10)
+      middleman-core (= 4.1.10)
       sass (>= 3.4.0, < 4.0)
     middleman-autoprefixer (2.7.0)
       autoprefixer-rails (>= 6.3.1, < 7.0.0)
       middleman-core (>= 3.3.3)
-    middleman-cli (4.0.0)
+    middleman-cli (4.1.10)
       thor (>= 0.17.0, < 2.0)
-    middleman-core (4.0.0)
+    middleman-core (4.1.10)
       activesupport (~> 4.2)
-      addressable (~> 2.4.0)
+      addressable (~> 2.3)
       backports (~> 3.6)
       bundler (~> 1.1)
-      capybara (~> 2.5.0)
-      contracts (~> 0.12.0)
+      contracts (~> 0.13.0)
+      dotenv
       erubis
       execjs (~> 2.0)
-      fastimage (~> 1.8)
-      hamster (~> 2.0)
+      fast_blank
+      fastimage (~> 2.0)
+      hamster (~> 3.0)
       hashie (~> 3.4)
       i18n (~> 0.7.0)
-      listen (~> 3.0)
+      listen (~> 3.0.0)
+      memoist (~> 0.14)
       padrino-helpers (~> 0.13.0)
+      parallel
       rack (>= 1.4.5, < 2.0)
       sass (>= 3.4)
+      servolux
       tilt (~> 1.4.1)
-      uglifier (~> 2.6)
+      uglifier (~> 3.0)
     middleman-sprockets (4.0.0)
       middleman-core (~> 4.0)
       sprockets (>= 3.0)
     middleman-syntax (3.0.0)
       middleman-core (>= 3.2)
       rouge (~> 2.0)
-    mime-types (3.1)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
-    mini_portile2 (2.1.0)
     minitest (5.9.0)
-    nokogiri (1.6.8)
-      mini_portile2 (~> 2.1.0)
-      pkg-config (~> 1.1.7)
     padrino-helpers (0.13.3.1)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.1)
       tilt (>= 1.4.1, < 3)
     padrino-support (0.13.3.1)
       activesupport (>= 3.1)
-    pkg-config (1.1.7)
+    parallel (1.9.0)
     rack (1.6.4)
-    rack-test (0.6.3)
-      rack (>= 1.0)
     rb-fsevent (0.9.7)
     rb-inotify (0.9.7)
       ffi (>= 0.5.0)
     redcarpet (3.3.4)
     rouge (2.0.5)
-    ruby_dep (1.4.0)
     sass (3.4.22)
-    sprockets (3.4.1)
+    servolux (0.12.0)
+    sprockets (3.7.0)
+      concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     thor (0.19.1)
     thread_safe (0.3.5)
     tilt (1.4.1)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
-    uglifier (2.7.2)
-      execjs (>= 0.3.0)
-      json (>= 1.8.0)
-    xpath (2.0.0)
-      nokogiri (~> 1.3)
+    uglifier (3.0.2)
+      execjs (>= 0.3.0, < 3)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  middleman (~> 4.0.0)
+  middleman (~> 4.1.0)
   middleman-autoprefixer (~> 2.7.0)
   middleman-sprockets (~> 4.0.0)
   middleman-syntax (~> 3.0.0)