[Vimperator] [patch]bookmark with keyword supported

[joshyu]

I am a newbie to vimperator and linux. but I really love this extension.
I find the default add-bookmark doesn't support keyword,so I add some
code and implement the function. because while using firefox, I do love
to use its keyword.
you can use it as following words:
:bma  -t title -k keyword <url>

the first patch of mine, please give advice. thanks.

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* this is josh, a software developer, dabbled in GNU/linux for several months. *
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