added compass, added some basic stylesheets

source/stylesheets/library/_clearfix.sass

@@ -0,0 +1,24 @@
+// based on compass clearfix
+
+@import _hacks.sass
+
+// Extends the element to enclose any floats it contains.
+// This basic method is preferred for the usual case, when positioned content will not show outside the bounds of the container.
+// Recommendations include using this in conjunction with a width:
+// http://www.quirksmode.org/blog/archives/2005/03/clearing_floats.html
+=clearfix
+  :overflow hidden
+  +has-layout
+
+// Extends the element to enclose any floats it contains.
+// This older "Easy Clearing" method has the advantage of allowing positioned elements to hang outside the bounds of the container, at the expense of more tricky CSS.
+// http://www.positioniseverything.net/easyclearing.html
+=pie-clearfix
+  &:after
+    :content " "
+    :display block
+    :height 0
+    :clear both
+    :overflow hidden
+    :visibility hidden
+  +has-layout