A simple tftp client

Currently no interactive prompt available. All actions are performed through command line arguments.

Compile with:   
    $ cc tftp.c -o tftp

Run with:   
    $ ./tftp <hostname/ip> <port> <get/put> <filename>

'hostname', 'ip' and 'port' refer to the address of tftp server.

Block size of 512 is used and is not configurable at the moment.
There is no limitation on the size of file.