added ability to collapse layout

stylesheets/_layout.sass

@@ -75,8 +75,18 @@ html body
 #page
   +clearfix
   background-color= !page_bg
+  &.collapsed
+    .page_width
+      width= !page_width - !sidebar_width
+    #main
+      width: 100%
+      .pre_expander
+        display: none
+    #sidebar
+      float: none
   .page_width
     +clearfix
+    position: relative
     padding:
       top: 25px
       bottom: 25px
@@ -91,6 +101,20 @@ html body
   &.expanded
     width: 100%
 
+#sidebar
+  float: left
+  width= !sidebar_width
+  margin-left= !sidebar_margin
+  font-size: 80%
+  line-height: 1.625em
+  h4
+    margin: 20px 0 0
+    &:first-child
+      margin-top: 10px
+    .small
+      +sans-font
+      font-size: 50%
+
 #footer
   position: relative
   z-index: 2

stylesheets/_partials.sass

@@ -1,3 +1,4 @@
+@import partials/shared.sass
 @import partials/blog.sass
 @import partials/syntax.sass
 @import partials/search.sass

stylesheets/partials/_shared.sass

@@ -0,0 +1,13 @@
+#collapser
+  +sans-font
+  display: block
+  cursor: pointer
+  background: #f8f8f8
+  color: #888
+  padding: 5px 10px
+  font-size: 10px
+  line-height: 150%
+  cursor: pointer
+  position: absolute
+  top: 0
+  right: 0

stylesheets/partials/_sidebar.sass

@@ -1,18 +1,3 @@
-#sidebar
-  float: left
-  width= !sidebar_width
-  margin-left= !sidebar_margin
-  
-  h4
-    margin: 20px 0 0
-    &:first-child
-      margin-top: 10px
-    .small
-      +sans-font
-      font-size: 50%  
-  font-size: 80%
-  line-height: 1.625em
-
 #twitter, #delicious
   +border-radius
   background: #f8f8f8