WP 3.6 compatibility: fixed jQuery tabs issue

tabs 'select' function was removed from new jQuery UI.
Fixed issue related to PHP version <5.3

Related Forum topic:
https://usabilitydynamics.com/products/wp-property/forum/topic/wp-property-management-fatal-error/
Release 1.38.1

* Added compatibility with Wordpress 3.6.
* Removed anonymous function which caused parse error in PHP <5.3.
Merge pull request #9 from pemaxim/development

Release 1.38.1