Bump version number to a numeric-only one to appease py2exe

LATEST_VERSION

@@ -1 +1 @@
-2012.11.27b
+2012.11.28

youtube_dl/__init__.py

@@ -21,7 +21,7 @@ __authors__  = (
 	)
 
 __license__ = 'Public Domain'
-__version__ = '2012.11.27b'
+__version__ = '2012.11.28'
 
 UPDATE_URL = 'https://raw.github.com/rg3/youtube-dl/master/youtube-dl'
 UPDATE_URL_VERSION = 'https://raw.github.com/rg3/youtube-dl/master/LATEST_VERSION'