Make compatible with jQuery v3.0. Replace deprecated functions.

[bridgeport]

EXPLANATION OF THE ISSUE

The s2member JavaScript file /wp-content/plugins/s2member/s2member-o.php uses functions that are deprecated in jQuery 3.0.

Using:

• s2member v170722 (with Pro add-on)
• WordPress 4.9
• jQuery 3.2.1
• jQuery Migrate 3.0.0

This is just a heads up, as these functions still exist in v3.0, but may be removed in the next major version.

STEPS TO REPRODUCE THE ISSUE

Visit a page that loads the s2member JavaScript file (e.g., authorize.net or paypal checkout page) with jQuery 3 and jQuery migrate loaded, and it'll report the following within console.log()

JQMIGRATE: jQuery.fn.removeAttr no longer sets boolean properties: disabled
JQMIGRATE: jQuery.fn.bind() is deprecated

The following page lists the jQuery deprecation warnings and how to resolve them:
https://github.com/jquery/jquery-migrate/blob/master/warnings.md

Solution for jQuery.fn.removeAttr():
https://github.com/jquery/jquery-migrate/blob/master/warnings.md#jqmigrate-jqueryfnremoveattr-no-longer-sets-boolean-properties

Solution for jQuery.fn.bind():
https://github.com/jquery/jquery-migrate/blob/master/warnings.md#jqmigrate-jqueryfnbind-is-deprecated

Thanks.

[KTS915]

WordPress doesn't use jQuery v3. It uses v1.12. s2Member reflects that.