adds background pattern (#242)

* adds YAML section bg image

* adds bgimage

* adds bgimage config

* fixes layout for processed css file

_config.yml

@@ -7,6 +7,10 @@
 url: "http://username.github.io"
 baseurl: ""
 
+# If you want a background image you can add it here.
+bgimage: "/img/bgimage.png"
+
+
 # If you are building a GitHub project page then use these settings:
 #url: "http://username.github.io/projectname"
 #baseurl: "/projectname"

css/main.css

@@ -1,3 +1,7 @@
+---
+layout: null
+---
+
 @import url("pygment_highlights.css");
 
 /* --- General --- */
@@ -100,6 +104,10 @@ img {
   background: #F5F5F5;
   border-bottom: 1px solid #EAEAEA;
   font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
+  {% if site.bgimage %}
+  background-image: url({{ site.bgimage }});
+  background-attachment: fixed;
+  {% endif %}
 }
 
 .navbar-custom .nav li a {
@@ -261,6 +269,10 @@ footer {
   border-top: 1px #EAEAEA solid;
   margin-top: 50px;
   font-size: 14px;
+  {% if site.bgimage %}
+  background-image: url({{ site.bgimage }});
+  background-attachment: fixed;
+  {% endif %}
 }
 
 footer a {