WooCommerce API Manager 3.3.4

* Fix: Array to string conversion when building where clause for API Customers dashboard.
* Fix: InvalidArgumentException: API Resource argument passed in is not an object.
* Fix: PHP Warning: filemtime(): stat failed.

* Fix: Email address search on API Customer dashboard.
* Fix: Enter the page number and hit enter to go to that page on API Customer dashboard.

* Fix: API Key activations not displayed when Product Order API Key hidden in api-keys.php template.
* Fix: Product ID column table header text wrapped when it should not be in the api-keys.php template.
* Fix: Release Date column table header text wrapped when it should not be in the api-downloads.php template.
* Update: Updated templates/myaccount/api-keys.php.
* Update: Updated templates/myaccount/api-downloads.php.php.
* New: Settings page link to API Manager > API Customers submenu.