[Tracker] Make Query nicer but supporting several keywords

["Anders Rune Jensen" <anders iola dk>]

Hi

I've made a patch that improves Query by making it accept a list of
keywords instead of just a single keyword. The code doesn't update the
introspection file since I'm not familiar with how to do that :)

--
Anders Rune Jensen
http://people.iola.dk/anders/

Attachment: tracker-several-keywords-support.patch
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