added compass, added some basic stylesheets

source/stylesheets/library/_float.sass

@@ -0,0 +1,16 @@
+// based on compass float
+
+@import modules/_clearfix.sass
+
+// Available as alternate syntax with just +float
+=float(!side = "left")
+  :display inline
+  :float= !side
+
+// Implementation of float:left with fix for double-margin bug
+=float-left
+  +float("left")
+
+// Implementation of float:right with fix for double-margin bug
+=float-right
+  +float("right")