enhance flyout demo
fix #515 flyout use now always the dark theme
add CustomFlyout to NET45 demo
ThemeManager recursive search
fix Caliburn.Metro.Demo

i don't know enough about Caliburn.Metro.Demo to solve the problem like
in normal demo, but this works now
improve Flyout3View example
fix Foreground for ListViewItem
update custom flyout demo for @spiritdead
move main res dict to ThemeManager
don't need FlyoutWhiteBrush any more
introduce FlyoutBackgroundBrush
nicer flayout header
introduce CloseCommand for Flyout #679
demo for flyout CloseCommand
use BlackBrush for flyout header icon
Merge pull request #710 from MahApps/515-punker76-theme-with-flyouts

enhancement to fix #515 (flyouts and themes)