Deal with turbolinks

$document().ready is only called when the DOM completes loading.  Since
turbolinks loads new data into the DOM without completely reloading, the ready
event is never fired.  We can account for this by using the page:load event.

app/assets/javascripts/pastes.js.coffee

@@ -1,6 +1,6 @@
 # Place all the behaviors and hooks related to the matching controller here.
 # All this logic will automatically be available in application.js.
 # You can use CoffeeScript in this file: http://coffeescript.org/
-$(document).ready ->
-  $("pre code").each (i, e) ->
+$(document).on 'ready page:load', ->
+  $(".highlight pre code").each (i, e) ->
       hljs.highlightBlock e

app/views/pastes/_form.html.erb

@@ -1,7 +1,7 @@
 <%= form_for @paste do |f| %>
   <div class="form-group">
     <%= f.label :content %>
-    <%= f.text_area :content, class: 'form-control' %>
+    <%= f.text_area :content, class: 'form-control', rows: 15 %>
   </div>
   <%= f.submit 'Paste it!', class: 'btn btn-primary'  %>
 <% end %>

app/views/pastes/show.html.erb

@@ -1 +1 @@
-<pre><code><%= @paste.content %></code></pre>
+<div class="highlight"><pre><code><%= @paste.content %></code></pre></div>