Add package flake8 on requirements file
Write make file, add method test/pep8
change nosetests to make test
run pep8 check before
Fix pep8: W191 indentation contains tabs, refs #42
Fix pep8 on test file, refs #42
FIx pep8 on database.py file, refs #42
Fix flake8 exclude
Fix pep8 on CepTracker.py file, refs #42
Fix pep8 on PostmonServer file, ref #42