Please add a restries option to prevent an endless loop

[GoogleCodeExporter]

Please add an --retries option.

If the chip isn't ready to receive the firmware the patch command keeps trying 
to update in an endless loop.
It would be nice if the program would end after 'N' tries with an exit code.
For example an '--retries 5' option at the command line for max 5 retries.

If the patch command is used in a script this way it provides for a nice way of 
detecting if the command was successful.

Original issue reported on code.google.com by [email protected] on 27 May 2014 at 8:44