remove _null and _undefined

they have no significant effect on minified and gziped size. in fact
they make things worse.

file        | before     | after removal
----------------------------------------
concat      | 325415     | 325297
min         | 62070      | 62161
min + gzip  | 25187      | 25176

The bottom line is that we are getting 0.05% decrease in size after
gzip without all of the hassle of using underscores everywhere.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/jqLite.js b/src/jqLite.js
index cda8ec70..9c96df4a 100644
--- a/src/jqLite.js
+++ b/src/jqLite.js
@@ -105,7 +105,7 @@ function JQLiteData(element, key, value) {
     }
     cache[key] = value;
   } else {
-    return cache ? cache[key] : _null;
+    return cache ? cache[key] : null;
   }
 }