using uri_escape_utf8 because Net::OAuth uses uri_escape_utf8

[yappo]

今は特に必要は無いんですが、Net::OAuth が uri_escape_utf8 を使っていて
AnyEvent::Twitter::Stream が uri_escape を使ってると、将来的に %post_args に日本語とか
入れるようになると困った事になると思うので、パッチ書いときました。

[punytan]

+1 for #日本語ハッシュタグ

[Songmu]

Today, this issue troubled my co-worker for searching japanese hash tags.

I hope merge it.

[miyagawa]

This seems to cause conflicts against the current master. Can you rebase and push again, and I will merge it. Thanks!

[Songmu]

Thanks for feedback. Okay, I'll do another p-r soon.