First version
add copyright notice, licence, before making project public
installation instructions
tribute to pythologic, shai berger
simplify use of variables in pyDatalog program
odd and even
constants in equality
API : support for engine.ask('<predicate>')
make it python 3 compatible, using 2to3.py
datalog.execute + more tests
remove debug print statements
support for expressions, e.g. N1 = N-1
remove dependence on expression.lua.  Clean-up some code.  Add factorial and fibonacci tests.
make compatible with python 3
prepare for distutils release on pypi
release 0.1.1 on pypi
propose default_datalog_engine in decorator.  Add more tests.
rename 'execute' --> 'load'
rename 'execute' --> 'load'
support for deep recursion, with fast option
use 4 spaces for tab in pyDatalog.lua