WooCommerce Advanced Product Labels 1.3.1

* [IMPORTANT NOTE] - As of this version, the plugin requires PHP 5.3 or higher to function
* [Add] - 4 new label types!
* [Add] - WC 2.7 compatibility
* [Improvement] - BIG performance improvements
* [Improvement] - BIG refactor of the backend conditions - please verify your setup if using custom coded condition
* [Improvement] - Smoother User Experience with conditions
- Instant adding of conditions / condition groups
- Only show valid operator options
- Instantly show condition descriptions
- Deleting entire condition groups
- Duplicate condition groups

* [Add] - Condition instance argument to 'wapl_condition_values' filter
* [Improvement] - Add jquery-ui-sortable dependency to script
* [Improvement] - Only load assets on related admin pages
* [Fix] - Warning when creating a new label
* [Add] - Basic Composite product support for discount smart label