Add pydoc information

This patch adds pydoc documentaion comments to the akanda code.  The following
functions remain undocumented:

ensure_mapping
generic_to_host
host_to_generic
_update_addresses
  _get_cmd
_update_set
_alter_route
_parse_interfaces
_parse_interface
_parse_head
_parse_inet
_parse_lladdr
pep8 compliance

Fixed indentation mismatch (spaces/tabs) and a line containing more than 80 chars.
Merge pull request #84 from drwahl/linux

Add pydoc information
Improved inline docs for `drivers.ip`.
Merge pull request #85 from ryanpetrello/linux

Improved inline docs for `drivers.ip`.
Merge remote-tracking branch 'upstream/linux' into linux