Add overflow-wrap: break-word; to post_body CSS

This will cause long, unbroken posts to wrap.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/static/board/style.css

@@ -68,7 +68,10 @@ th {
 /*******************************************************************************
  Posts
 ********************************************************************************/
-/*.post_body { }*/
+.post_body {
+    overflow-wrap: break-word;
+}
+
 .post_image_info {
     font-size: small;
     padding-bottom: 5px;