Fixed issue #308

This commit also fixes a bug that caused the window to not maximize
correctly on a secondary monitor when ignoring the taskbar.
Update Flyout.cs
Dragging interop fix

Most users will not notice any difference, but I've changed the way
dragging windows is handled specifically to allow interop with the the
sticky windows library here:

https://bitbucket.org/alfonse/wpf-window-snap
Merge pull request #430 from flagbug/issue-308-fix

Fixed issue #308
Merge pull request #432 from Traquina/patch-2

Update Flyout.cs
bugfix for issue raised in #435
Merge branch 'master' of https://github.com/MahApps/MahApps.Metro
Merge pull request #434 from 5flags/master

Window drag interop fix
fix for #441 from @dak8
Merge branch 'master' of https://github.com/MahApps/MahApps.Metro