Implement stripUnit with quantity. Oops fdescribe.

src/scripts/core.js

@@ -79,11 +79,7 @@ var Chartist = {
    * @return {Number} Returns the string as number or NaN if the passed length could not be converted to pixel
    */
   Chartist.stripUnit = function(value) {
-    if(typeof value === 'string') {
-      value = value.replace(/[^0-9\+-\.]/g, '');
-    }
-
-    return +value;
+    return Chartist.quantity(value).value;
   };
 
   /**

test/spec/spec-core.js

@@ -280,7 +280,7 @@ describe('Chartist core', function() {
     });
   });
   
-  fdescribe('quantity', function() {
+  describe('quantity', function() {
     
     it('should return value for numbers', function() {
       expect(Chartist.quantity(100)).toEqual({ value: 100 });