Fix: Corrected activation routine issues that could prevent version number storage.

Feature: Added ability to change what part of the trigger element will be visible when the popup triggers.
Improvement: Relabeled and reworked existing settings to be more intuitive.
Improvement: Updated for full Popup Maker v1.7 support.
- Leveraged the new AssetCache reducing the need to load an extra JS file for this extension.
- Autoloader
- Upgrade routines.
Tweak: Replaced the scroll_trigger shortcode with a namespaced version [pum_scroll_trigger]
Tweak: Removed Scroll Trigger shortcode button from popup post type.

Refactored for better trigger position accuracy.
Refactroed to allow for creating something similar to a floating nav bar that opens and closes continuously.

Feature: Added (v1.4) trigger Scroll.
Improvement: Migrated code to new PUM boilerplate v2.
Developer: Added automated build routines to eliminate build time errors making it to releases.

Feature: Trigger Point setting. Allows you to set whether the trigger fires at the top or bottom of the screen or a ratio based position for %.
Improvement: Improved the scroll trigger accuracy, especially for % based distances. You can now set it to 100% which will trigger just as the user scrolls to the very bottom.
Improvement: Minor performance improvements in the JavaScript.
Fix: Bugged % based scroll when position set above a certain level.

Rewritten to use the PM Boilerplate.
Added POT file for translations.
Added option to close popup when user scrolls back up
Added new trigger \"Element\" allowing user to specify an element by CSS / jQuery Selector which when scrolled on screen will trigger the popup.