Update jekyll version.

.travis.yml

@@ -1,4 +1,5 @@
 language: ruby
+rvm: 2.1.0
 cache: bundler
 sudo: false
 env:

Gemfile

@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
 
-gem 'github-pages'
+gem 'github-pages', "38"
 gem "rake"
 gem 'html-proofer'

Gemfile.lock

@@ -2,56 +2,57 @@ GEM
   remote: https://rubygems.org/
   specs:
     RedCloth (4.2.9)
-    activesupport (4.2.0)
+    activesupport (4.2.3)
       i18n (~> 0.7)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.3.7)
+    addressable (2.3.8)
     blankslate (2.1.2.4)
     celluloid (0.16.0)
       timers (~> 4.0.0)
     classifier-reborn (2.0.3)
       fast-stemmer (~> 1.0)
-    coffee-script (2.3.0)
+    coffee-script (2.4.1)
       coffee-script-source
       execjs
-    coffee-script-source (1.9.1)
+    coffee-script-source (1.9.1.1)
     colorator (0.1)
     colored (1.2)
-    ethon (0.7.3)
+    ethon (0.7.4)
       ffi (>= 1.3.0)
-    execjs (2.4.0)
+    execjs (2.5.2)
     fast-stemmer (1.0.2)
-    ffi (1.9.6)
+    ffi (1.9.10)
     gemoji (2.1.0)
-    github-pages (33)
+    github-pages (38)
       RedCloth (= 4.2.9)
       github-pages-health-check (~> 0.2)
       jekyll (= 2.4.0)
       jekyll-coffeescript (= 1.0.1)
+      jekyll-feed (= 0.3.0)
       jekyll-mentions (= 0.2.1)
-      jekyll-redirect-from (= 0.6.2)
+      jekyll-redirect-from (= 0.8.0)
       jekyll-sass-converter (= 1.2.0)
-      jekyll-sitemap (= 0.6.3)
+      jekyll-sitemap (= 0.8.1)
       jemoji (= 0.4.0)
       kramdown (= 1.5.0)
-      liquid (= 2.6.1)
+      liquid (= 2.6.2)
       maruku (= 0.7.0)
       mercenary (~> 0.3)
-      pygments.rb (= 0.6.1)
+      pygments.rb (= 0.6.3)
       rdiscount (= 2.1.7)
-      redcarpet (= 3.1.2)
+      redcarpet (= 3.3.1)
       terminal-table (~> 1.4)
-    github-pages-health-check (0.2.2)
+    github-pages-health-check (0.3.1)
       net-dns (~> 0.6)
       public_suffix (~> 1.4)
     hitimes (1.2.2)
     html-pipeline (1.9.0)
       activesupport (>= 2)
       nokogiri (~> 1.4)
-    html-proofer (2.1.0)
+    html-proofer (2.3.0)
       addressable (~> 2.3)
       colored (~> 1.2)
       mercenary (~> 0.3.2)
@@ -77,60 +78,61 @@ GEM
       toml (~> 0.1.0)
     jekyll-coffeescript (1.0.1)
       coffee-script (~> 2.2)
-    jekyll-gist (1.1.0)
+    jekyll-feed (0.3.0)
+    jekyll-gist (1.2.1)
     jekyll-mentions (0.2.1)
       html-pipeline (~> 1.9.0)
       jekyll (~> 2.0)
     jekyll-paginate (1.1.0)
-    jekyll-redirect-from (0.6.2)
-      jekyll (~> 2.0)
+    jekyll-redirect-from (0.8.0)
+      jekyll (>= 2.0)
     jekyll-sass-converter (1.2.0)
       sass (~> 3.2)
-    jekyll-sitemap (0.6.3)
+    jekyll-sitemap (0.8.1)
     jekyll-watch (1.2.1)
       listen (~> 2.7)
     jemoji (0.4.0)
       gemoji (~> 2.0)
       html-pipeline (~> 1.9)
       jekyll (~> 2.0)
-    json (1.8.2)
+    json (1.8.3)
     kramdown (1.5.0)
-    liquid (2.6.1)
-    listen (2.9.0)
-      celluloid (>= 0.15.2)
+    liquid (2.6.2)
+    listen (2.10.1)
+      celluloid (~> 0.16.0)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
     maruku (0.7.0)
     mercenary (0.3.5)
     mini_portile (0.6.2)
-    minitest (5.5.1)
+    minitest (5.7.0)
     net-dns (0.8.0)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
-    parallel (1.4.1)
+    parallel (1.6.1)
     parslet (1.5.0)
       blankslate (~> 2.0)
-    posix-spawn (0.3.10)
-    public_suffix (1.4.6)
-    pygments.rb (0.6.1)
+    posix-spawn (0.3.11)
+    public_suffix (1.5.1)
+    pygments.rb (0.6.3)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.2.0)
     rake (10.4.2)
-    rb-fsevent (0.9.4)
+    rb-fsevent (0.9.5)
     rb-inotify (0.9.5)
       ffi (>= 0.5.0)
     rdiscount (2.1.7)
-    redcarpet (3.1.2)
+    redcarpet (3.3.1)
     safe_yaml (1.0.4)
-    sass (3.4.13)
-    terminal-table (1.4.5)
+    sass (3.4.16)
+    terminal-table (1.5.2)
     thread_safe (0.3.5)
     timers (4.0.1)
       hitimes
     toml (0.1.2)
       parslet (~> 1.5.0)
-    typhoeus (0.7.1)
-      ethon (>= 0.7.1)
+    typhoeus (0.7.2)
+      ethon (>= 0.7.4)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
     yajl-ruby (1.2.1)
@@ -140,7 +142,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  github-pages
+  github-pages (= 38)
   html-proofer
   rake