Use 127.0.0.1 instead of localhost

Localhost might resolve to the ipv6 ::1, but flask only binds to 127.0.0.1 by default. This makes the webbrowser connect to the correct IP.
update with info from README
Update to version v0.6.4
Merge branch 'release/v0.6.4' into develop
Merge branch 'patch-1' of git://github.com/valhallasw/sandman into valhallasw-patch-1

Conflicts:
	sandman/model/__init__.py