update dependencies (#241)

Gemfile.lock

@@ -1,68 +1,48 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    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-source
-      execjs
-    coffee-script-source (1.9.1)
-    colorator (0.1)
-    execjs (2.4.0)
-    fast-stemmer (1.0.2)
-    ffi (1.9.8)
-    hitimes (1.2.2)
-    jekyll (2.5.3)
-      classifier-reborn (~> 2.0)
-      colorator (~> 0.1)
-      jekyll-coffeescript (~> 1.0)
-      jekyll-gist (~> 1.0)
-      jekyll-paginate (~> 1.0)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    colorator (1.1.0)
+    ffi (1.9.18)
+    forwardable-extended (2.6.0)
+    jekyll (3.6.2)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
-      liquid (~> 2.6.1)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
       mercenary (~> 0.3.3)
-      pygments.rb (~> 0.6.0)
-      redcarpet (~> 3.1)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 3)
       safe_yaml (~> 1.0)
-      toml (~> 0.1.0)
-    jekyll-coffeescript (1.0.1)
-      coffee-script (~> 2.2)
-    jekyll-gist (1.1.0)
-    jekyll-paginate (1.1.0)
-    jekyll-sass-converter (1.3.0)
-      sass (~> 3.2)
-    jekyll-watch (1.2.1)
-      listen (~> 2.7)
-    kramdown (1.6.0)
-    liquid (2.6.2)
-    listen (2.9.0)
-      celluloid (>= 0.15.2)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
-    mercenary (0.3.5)
-    parslet (1.5.0)
-      blankslate (~> 2.0)
-    posix-spawn (0.3.10)
-    pygments.rb (0.6.2)
-      posix-spawn (~> 0.3.6)
-      yajl-ruby (~> 1.2.0)
-    rb-fsevent (0.9.4)
-    rb-inotify (0.9.5)
-      ffi (>= 0.5.0)
-    redcarpet (3.1.2)
-    rouge (1.8.0)
+    jekyll-sass-converter (1.5.1)
+      sass (~> 3.4)
+    jekyll-watch (1.5.1)
+      listen (~> 3.0)
+    kramdown (1.16.2)
+    liquid (4.0.0)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    mercenary (0.3.6)
+    pathutil (0.16.1)
+      forwardable-extended (~> 2.6)
+    public_suffix (3.0.1)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
+    redcarpet (3.4.0)
+    rouge (2.2.1)
+    ruby_dep (1.5.0)
     safe_yaml (1.0.4)
-    sass (3.4.13)
-    timers (4.0.1)
-      hitimes
-    toml (0.1.2)
-      parslet (~> 1.5.0)
-    yajl-ruby (1.2.1)
+    sass (3.5.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
 
 PLATFORMS
   ruby
@@ -73,4 +53,4 @@ DEPENDENCIES
   rouge
 
 BUNDLED WITH
-   1.14.6
+   1.15.4