Added confirmation before deleting contacts. Asked in #1706

http://www.sogo.nu/bugs/view.php?id=1706
Merge pull request #11 from altxt/delete-confirm

Ask for confirmation before deleting contacts. Requested in bug #1706
Fix for #1706 - version bump
Percent-encode the addressbook URL so it can contain special and national characters

email addresses as usernames in the path section in particular