Remove the mateconf DEPEND as mate moved to gsetting.

See below for more info.
http://wiki.mate-desktop.org/status:1.6
http://wiki.mate-desktop.org/mateconf_to_gsettings

Solves issue 5 (https://github.com/infirit/mate-overlay/issues/5)

Thanks to mkercmar for pointing this out.

There is one ebuild left that has not been ported over which is mate-applets.

-------
Remove mateconf DEPEND
app-arch/mate-file-archiver-1.5.1
app-editors/mate-text-editor-1.5.0
mate-base/mate-desktop-1.5.6
mate-base/mate-control-center-1.5.3
mate-base/mate-panel-1.5.5
mate-extra/mate-power-manager-1.5.1
mate-extra/mate-utils-1.5.0
dev-libs/libmateweather-1.5.1
mate-base/mate-session-manager-1.5.{0,1}
mate-base/libmatekbd/libmatekbd-1.5.{0,1}
mate-base/mate-settings-daemon-1.5.{4,5}
mate-base/mate-desktop-1.5.5
mate-base/mate-keyring-1.5.0
mate-base/mate-panel-1.5.4
mate-base/mate-file-manager-1.5.{2,3}
mate-extra/mate-screensaver-1.5.1
mate-extra/mate-system-monitor-1.5.1
mate-extra/mate-media-1.5.1
mate-extra/mate-file-manager-sendto-1.5.0
media-gfx/mate-image-viewer-1.5.0
net-wireless/mate-bluetooth-1.5.0
x11-misc/mate-notification-daemon-1.5.1
x11-terms/mate-terminal-1.5.0
x11-wm/mate-window-manager-1.5.3

Remove USE flag + config option + Depend
app-text/mate-document-viewer-1.5.0