small changes
working on using message. Cleaing up line received
Merge branch 'new_message'
Fix the classmethod to return new instance

Class method was failing with its from_str alternate constructor.
remove extraneous print
add not about needing better setup methods
show that line mode is turned back on after file transfer complete
Change rawDataReceived to allow close after write

If after having written to the file, rawDataReceived has 0 characters
left to write, then close the file for writing and reset to line mode.
Merge pull request #2 from derwolfe/file_send_message

File send message