Allow custom objects, fix issues caused by GF 1.7.7

= 2.3 =
* API: __Now fully supports custom objects!__
* API: Fixed error with endless spinning when choosing "Select the form
to tap into"
* Web to Lead: Fixed <a
href="http://wordpress.org/support/topic/form-editing-broken-with-salefo
rce-web-to-lead">issue</a> on Form Settings page caused by Gravity
Forms 1.7.7 update.