hoge2をhoge1ブランチへpull request
$ hub pull-request -b user:hoge1 -h user:hoge2
hoge2ブランチをmasterへpull request
$ hub pull-request -h user:hoge2
hoge2をhoge1ブランチへpull request
$ hub pull-request -b user:hoge1 -h user:hoge2
hoge2ブランチをmasterへpull request
$ hub pull-request -h user:hoge2