Added operator== for QDBusArgument.
Added operator== for QDBusArgument.

Ps.: This is a workaround that should be removed when Qt has support for
this. There is already a merge request
(http://qt.gitorious.org/qt/qt/merge_requests/1657) in place and the
fix should be in next Qt versions.

freedesktop-unofficial-mirror/telepathy__telepathy-qt4,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,tiagosh/telepathy-qt,TelepathyQt/telepathy-qt,special/telepathy-qt-upstream,TelepathyQt/telepathy-qt,TelepathyQt/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,anantkamath/telepathy-qt,detrout/telepathy-qt,TelepathyIM/telepathy-qt,anantkamath/telepathy-qt,TelepathyIM/telepathy-qt,detrout/telepathy-qt,special/telepathy-qt-upstream,freedesktop-unofficial-mirror/telepathy__telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,special/telepathy-qt-upstream,TelepathyQt/telepathy-qt,tiagosh/telepathy-qt,TelepathyIM/telepathy-qt,anantkamath/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,tiagosh/telepathy-qt,TelepathyIM/telepathy-qt,tiagosh/telepathy-qt,detrout/telepathy-qt