pep8 fixes

- more empty lines
- splitted import of os and os.path
- moved _IS_VCS__NAMES up in code
u() function now works in the same way for PY2 and for PY3
misletter in doc
initial configuration for tests
initial tests for ff.u() function
initial version of tests for FFPlugin
folder for testing purposes
ignore test/playground/*
ignore PyCharm folder
absolute paths
ignore folders from venv: .Python, include
moved PY2 into test_config and generalizations of tests
append to sys.path in setUp, and remove it iin tearDown
FFPlugins.find_all - export searching of modules to external helper
test for ff.FFPlugins class
TestFFPlugin.tearDown: automated removing of files
tests for ff.ask() function
fixed import of StringIO for py3
ask: always sort replies
use functools.wraps in decorators

without this nose doesn't see my decorated tests :/