add some javascript libraries to linguist-vendored

Author: acburst

.gitattributes

@@ -1,2 +1,6 @@
 * text=auto
 **/*.html linguist-documentation
+js/velocity.min.js linguist-vendored
+js/hammer.min.js linguist-vendored
+js/jquery.easing.1.3.js linguist-vendored
+js/jquery.timeago.min.js linguist-vendored