* Feature - Added compatibility with the extension 'WooCommerce Table Rate Shipping'.
* Feature - Enhanced 'Shipping methods' selector on settings pages.
* Tweak - Remove expired time frames from the select field when the delivery date is the current date.
* Tweak - The time frame field is also required when the delivery date field is required.
* Tweak - Assign the first available time frame when the delivery fields are in auto mode.
* Tweak - Assign the first available time frame during subscriptions renewal if the customer preferences can't be satisfied.
* Tweak - Added button for defining time frames from the 'Delivery days' setting.
* Tweak - Removed 'delivery days' form field when creating a time frame for a single delivery day.
* Tweak - Remove older update notices on plugin activation.
* Tweak - Added URL verification to the actions of the database updater.
* Tweak - Added blank content when there are no elements defined in the 'Time frames' field.
* Tweak - Improved the initialization of the plugin settings and now they are loaded on demand.
* Fix - Fixed PHP 5.2 compatibility adding the missing middle part in some ternary operators.
* Dev - Added classes for representing a delivery day, a time frame and collections of them.
