Create graph_search.py

Graph Search pattern in python
Merge pull request #7 from Rootex/master

Created graph_search.py
iterator fix
Merge branch 'master' of github.com:faif/python-patterns
Zip parameters were reversed
Merge pull request #11 from betoboullosa/patch-1

Zip parameters were reversed
using @property in example

...also wrapped the code at 79 characters
bugfix

syntax error fixed
bugfix #2

Somehow the Mac OS X autosave function (I guess) messed up the file.
Added proper class declaration for Subject and corrected the syntax to
set the member variable.
Fixed a number of pep8 violations.
Merge pull request #14 from osscca/master

Fixed a number of pep8 violations