Enable multiple file upload for attachments
Enable multiple file upload for attachments

Fixes #130.

davidmz/pepyatka-html,epicmonkey/pepyatka-html,pepyatka/pepyatka-html,SiTLar/pepyatka-html,pepyatka/pepyatka-html,FreeFeed/freefeed-html,dsumin/freefeed-html,dsumin/freefeed-html,davidmz/pepyatka-html,FreeFeed/freefeed-html,epicmonkey/pepyatka-html,SiTLar/pepyatka-html