Probably path error in Windows

[IsaacLuo]

test code:

import flametree
chromats = flametree.file_tree('chromats.zip')
chromats._all_files[0].open('rb')

thrown error:

KeyError: "There is no item named 'chromats\\\\seq11.ab1' in the archive"

[Zulko]

From here:

"If a member filename is an absolute path, a drive/UNC sharepoint and leading (back)slashes will be stripped, e.g.: ///foo/bar becomes foo/bar on Unix, and C:\foo\bar becomes foo\bar on Windows."

So it should be fixable. It is a problem that the lib is not tested against Windows, but Travis doesnt allow it. AppVeyor does, but not sure if its worth the change now.