Update GemFile.lock with gems to use for windows platform

Gemfile

@@ -2,4 +2,5 @@ source 'https://rubygems.org'
 gem 'github-pages', '~>82'
 gem 'sass', '~>3.4.22'
 gem 'bourbon', '~>4.0.2'
-gem 'neat', '~>1.6.0'
+gem 'neat', '~>1.6.0'
+gem 'wdm', '>= 0.1.0' if Gem.win_platform?

Gemfile.lock

@@ -22,6 +22,7 @@ GEM
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
     ffi (1.9.10)
+    ffi (1.9.10-x64-mingw32)
     gemoji (2.1.0)
     github-pages (82)
       github-pages-health-check (= 1.1.0)
@@ -104,6 +105,9 @@ GEM
     nokogiri (1.6.8)
       mini_portile2 (~> 2.1.0)
       pkg-config (~> 1.1.7)
+    nokogiri (1.6.8-x64-mingw32)
+      mini_portile2 (~> 2.1.0)
+      pkg-config (~> 1.1.7)
     octokit (4.3.0)
       sawyer (~> 0.7.0, >= 0.5.3)
     pkg-config (1.1.7)
@@ -124,15 +128,18 @@ GEM
       ethon (>= 0.8.0)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
+    wdm (0.1.1)
 
 PLATFORMS
   ruby
+  x64-mingw32
 
 DEPENDENCIES
   bourbon (~> 4.0.2)
   github-pages (~> 82)
   neat (~> 1.6.0)
   sass (~> 3.4.22)
+  wdm (>= 0.1.0)
 
 BUNDLED WITH
    1.12.4