Make safe_netrc class compatible with old versions of Python

See merge request !5

In older versions of Python, the `netrc.netrc._parse` class took fewer
arguments. Luckily, we are not using any of the additional arguments,
so we can just pass through any `*args` and `**kwargs`.

Check permissions on netrc file

See merge request !4

The netrc.netrc class from the Python standard library applies access
safety checks (requiring that the netrc file is readable only by the
current user, and not by group members or other users) only if using the
netrc file in the default location (~/.netrc). This subclass applies the
same access safety checks regardless of the path to the netrc file.

Changes for Python 3 compatbility. Certain packages (m2crypto and pyxmpp) are not available for Python 3, so only the most superficial features of the package will work.

Implements default usage of random uuid for resource name; this may still be overridden by use of the -r flag.

Fixes error in debian python3-glue install hook:

Sorry: TabError: inconsistent use of tabs and spaces in indentation (pubsub.py, line 66)

Signed-off-by: Alexander Pace <alexander.pace@Lligo.org>

Signed-off-by: Alexander Pace <alexander.pace@Lligo.org>