widgets.browse: fix View->History from the file browser on python3

Avoid concatenating list and generator in python3 by expanding the
generator into a list before calling VisualizePaths.

Closes #274
Closes #275

Original-patch-by: Ben Cole <wengole@gmail.com>
Signed-off-by: David Aguilar <davvid@gmail.com>
browse: editor shortcut typofix

Use the "Launch Editor" shortcut in the browser.

Signed-off-by: David Aguilar <davvid@gmail.com>
main: add hotkeys for fetch, push, and pull

Signed-off-by: David Aguilar <davvid@gmail.com>