Clobber/delete destination ftp files as needed
Remove temporary file code when doing clobber ftp
Make destination_file variable for ftp put
Update version 0.10.1 to include ftp bugfix
Merge pull request #50 from sot/delete_before_ftp_put

FTP bugfix: clobber/delete destination sftp files as needed

Using FTP, an attempt to overwrite a remote file using a 'put' results in a successful file transfer.
Using SFTP, an attempt to overwrite a remote file using a 'put' results in an IOError.  This bugfix deletes the remote file before the put, allowing a successful overwrite and restoring the FTP-style behavior.