Release Name: 0.8.1

Notes:
Minor release with fixes and FTP tasks.


Changes:
Added:
- New 'encoding' parameter in mail task.
- Print duration (even if not in verbose mode) if build duration is greater than one minute.
- Added 'echo' parameter to prompt task so that you can use it to prompt for password for instance. Using 'highline' library so that this is a new Bee dependency.
- Added new 'ftp_login', 'ftp_get', 'ftp_put' and 'ftp_mkdir' tasks.
Fixed:
- Fixed user interruption management so that a stack trace is not printed.
- Rounded build duration to 3 significative numbers.