added _in and _out properties to Record

Signed-off-by: gremorian <ostico@gmail.com>
using _out everywhere in tests to keep the api uniform

Signed-off-by: gremorian <ostico@gmail.com>
Removed the use of backslash to multi-line under parentesis

Signed-off-by: gremorian <ostico@gmail.com>
Added Graph example in README

Signed-off-by: gremorian <ostico@gmail.com>
Fixed an error in test test_newIface