Bugfix of -f option.

[SaitoAtsushi]

This branch contains bugfix of -f option.
Regardless of the specification format value, previous youtube-dl download same video.
Cause of the problem is watching the conn.
I changed from conn to fmt_stream_map.

[rg3]

There is no way I'm pulling this, for many reasons.

There should be only one commit to pull, and a fast-forward merge is preferred. Rebase if needed.

The "Ignore download errors" commit is completely bogus. There's a command line option to ignore download errors.

I don't fully understand what you say in the pull request description, and what you mention cannot be easily found in the commits. I noticed a change from fmt_url_map to fmt_stream_map, but not conn. This is competely critical for the code to be merged.

You actually commented the Accept-Encoding header, reverting the changes from my own commit without any notice whatsoever!

You commited a change, then reverted it in a different commit (the "debug print" stuff).

Some commit messages leave a lot to be desired, like "bug fix" and "erase debug print" (lack of capitalization and what they do, in general).

You included a lot of stuff about the YouTube user InfoExtractor, which is nice but belongs to a completely different thing and should be handled in a separate pull request. I'm not discouraging you from submitting these changes, but they do not belong here.

[SaitoAtsushi]

Thanks for review.
My English skill is not enogh.
I could not describe commit message adequately.
It's same for git and python.
I am referring to your pointed out, I will start over.