preg_replace() /e deprecated

As of PHP 5.5
The preg_replace() /e modifier is now deprecated. Instead, use the
preg_replace_callback() function.
Appending parameters to URI

Parameters where not being attached to the API request preventing from
controlling the request, size, paging, etc.  I needed this
functionality now, though it could probably be better.
Etsy requires HTTPS now

It’s in the docs, needed for all API requests
Typo

Fixing Typo