Initial notices cleanup

* Add developer docs
* Clean up PHP notices
* Consolidate install add_option/update_option calls
* Convert methods to static as needed
* Corect `wp_enqueue_scripts` action call
* Correct __FILENAME__ constant usage
* General bail if `get_wp_settings` is empty
* Test current actions
* Update support link
* Use `delete_option` on deactivate than `update_option` which leaves records
Add continuous integration and localization

* Add continuous integration helpers
* Prep for localization