add susy/compass/sass for styling

Gemfile.lock

@@ -1,13 +1,19 @@
 GEM
   remote: http://rubygems.org/
   specs:
+    chunky_png (1.2.9)
     classifier (1.3.3)
       fast-stemmer (>= 1.0.0)
     colorator (0.1)
     commander (4.1.5)
       highline (~> 1.6.11)
+    compass (0.12.2)
+      chunky_png (~> 1.2)
+      fssm (>= 0.2.7)
+      sass (~> 3.1)
     fast-stemmer (1.0.2)
     ffi (1.9.3)
+    fssm (0.2.10)
     highline (1.6.20)
     jekyll (1.3.0)
       classifier (~> 1.3)
@@ -38,6 +44,10 @@ GEM
       ffi (>= 0.5.0)
     redcarpet (2.3.0)
     safe_yaml (0.9.7)
+    sass (3.2.12)
+    susy (1.0.9)
+      compass (>= 0.12.2)
+      sass (>= 3.2.0)
     syntax (1.0.0)
     yajl-ruby (1.1.0)
 
@@ -47,3 +57,4 @@ PLATFORMS
 DEPENDENCIES
   jekyll
   rake
+  susy