small changes

	modified:   cellular_automata/rules/base.py
	modified:   variable_equangular_test.py
Adds initial version of unit testing

	new file:   test/__init__.py
	new file:   test/cellular_automata/__init__.py
	new file:   test/cellular_automata/cells/__init__.py
	new file:   test/cellular_automata/lattices/__init__.py
	new file:   test/cellular_automata/rules/__init__.py
	new file:   test/cellular_automata/rules/test_basic.py