removed an unused object var $debug
more slog when go-syncuser()->debug() is TRUE
removed some extraneous calls to subscribe() due to mismatched array format
code sniffer spacing
* added nonce to the Sync to MailChimp button
* use wp_die() instead of die
* simplified how we set go-syncuser's debug option
escape the nonce before setting it as an <input> attribute
Merge pull request #8 from wluo/github-4020

more debug output plus a couple of cleanup fixes