Add file chooser facade and support for Linux and Windows#106

Merged

tito merged 4 commits intokivy:masterfrom depau:filechooser

Mar 10, 2015

+486-2

Commits on Mar 8, 2015

add filechooser facade and support for Linux and Windows
Davide Depau
committed
fix inheritance issue on windows filechooser implementation
Davide Depau
committed
add experimental support for Mac OS X
Davide Depau
committed
fix filter conversion on Mac OS X
Davide Depau
committed