Removed max-height on pre:

- We don't really have large code blocks just yet. Some of the code blocks had just enough content to cause scroll bars. We can adjust later if we have larger code blocks. My personal preference is to not have code blocks scroll vertically.

source/assets/stylesheets/foundation/_code.scss

@@ -20,7 +20,7 @@ pre {
   @include rhythm(.5, .5, .5, .5);
   @include bleed;
   display: block;
-  max-height: 340px;
+  // max-height: 340px;
   overflow-y: auto;
   word: {
     break: break-all;