Adding test_suite

 * Added test_suite to setup.py.
 * Added anydo_tests module.
 * Moved tests.py to new "anydo_tests" directory.
 * Run tests with "python setup.py test".

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Adding test code of pep 8 as style guide for Python code.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>