adding resizable class and mixin

bootstrap.css

@@ -6,7 +6,7 @@
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Designed and built with all the love in the world @twitter by @mdo and @fat.
- * Date: Thu Oct 27 23:45:36 PDT 2011
+ * Date: Fri Oct 28 18:57:30 PDT 2011
  */
 /* Reset.less
  * Props to Eric Meyer (meyerweb.com) for his CSS reset file. We're using an adapted version here	that cuts out some of the reset HTML elements we will never need here (i.e., dfn, samp, etc).

lib/mixins.less

@@ -135,6 +135,12 @@
           column-gap: @columnGap;
 }
 
+// Make any element resizable for prototyping
+.resizable(@direction: both) {
+  resize: @direction; // Options are horizontal, vertical, both
+  overflow: auto; // Safari fix
+}
+
 // Add an alphatransparency value to any background or border color (via Elyse Holladay)
 #translucent {
   .background(@color: @white, @alpha: 1) {