adds setWrapLimit to session

lib/ace/edit_session.js

@@ -1612,7 +1612,18 @@ var EditSession = function(text, mode) {
     this.getWrapLimit = function() {
         return this.$wrapLimit;
     };
-
+    
+    /**
+     * Sets the line length for soft wrap in the editor. Lines will break
+     *  at a minimum of the given length minus 20 chars and at a maximum
+     *  of the given number of chars.
+     * @param {number} limit The maximum line length in chars, for soft
+     *  wrapping lines.
+     */
+    this.setWrapLimit = function (limit) {
+        this.setWrapLimitRange(limit - 20, limit);
+    };
+    
     /**
     * Returns an object that defines the minimum and maximum of the wrap limit; it looks something like this:
     *