1. change 'pay/close' to 'pay/close...'

2. make it open a dialog similar to clicking 'message', asking for a feedback comment (defaults to 'Great work!'), and with a 'pay/close' and 'cancel' button

3. clicking 'pay/close' in the dialog should do what the original 'pay/close' did (and have a throbber.. like it did)
Merge pull request #28 from vodolaz095/master

Work done