Patch for setting title of Command Prompt in windows

[rg3]

Was: http://bitbucket.org/rg3/youtube-dl/issue/214/

So I have tweaked my little patch so that it doesn't do bad things on linux/mac. Note the check for the os.

def report_progress(self, percent_str, data_len_str, speed_str, eta_str):
                """Report download progress."""
                if self.params.get('noprogress', False):
                        return
                if (os.name == 'nt'):
                        os.system('title youtube-dl [%s]' % percent_str)                        
                self.to_stdout(u'\r[download] %s of %s at %s ETA %s' %
                                (percent_str, data_len_str, speed_str, eta_str), skip_eol=True)

[rg3]

Just wanted to clarify that, even if this issue has been open for a long time, I'm not against this feature. However, I'd like it to be optional (because it does not work on Linux virtual terminals, for example), to work on every platform, and not to launch a program every time the title has to be changed.

[yaplik]

setting title on linux: http://www.faqs.org/docs/Linux-mini/Xterm-Title.html

import sys
sys.stdout.write("\x1b]0;newtitle\x07")

[rg3]

Implemented by grawity and merged.