Set process title to youtube-dl

This allows killing all youtube-dl processes with killall youtube-dl, and shows up nicer in some programs.

youtube_dl/__init__.py

@@ -62,6 +62,7 @@ from .utils import (
     MaxDownloadsReached,
     preferredencoding,
     SameFileError,
+    setproctitle,
     std_headers,
     write_string,
 )
@@ -471,12 +472,15 @@ def parseOpts(overrideArguments=None):
 
     return parser, opts, args
 
+
 def _real_main(argv=None):
     # Compatibility fixes for Windows
     if sys.platform == 'win32':
         # https://github.com/rg3/youtube-dl/issues/820
         codecs.register(lambda name: codecs.lookup('utf-8') if name == 'cp65001' else None)
 
+    setproctitle(u'youtube-dl')
+
     parser, opts, args = parseOpts(argv)
 
     # Set user agent