start working on 1.0.0 release
Convert relative signal levels to dBm.

Thanks to LiorKirsh for finding out how to do this.
Added the autoconnect command
Made it possible to swap /etc/network/interfaces

Conflicts:
	tests/test_schemes.py
	wifi/utils.py
Make ensure_file_exists use fewer permissions.

This makes it possible to autocomplete without having write permission
to the interfaces file.