Added Path class; adjusted Traverser to use it
Added Path class; adjusted Traverser to use it

pombreda/py2neo,fpieper/py2neo,pombreda/py2neo,nicolewhite/py2neo,technige/py2neo,nicolewhite/py2neo,fpieper/py2neo,nicolewhite/py2neo,nigelsmall/py2neo,technige/py2neo,nigelsmall/py2neo,pombreda/py2neo,fpieper/py2neo,technige/py2neo