Introduce DEFAULT_LOGDEST

Make log destination configurable via environment variable or config
file.
define logdest in tests/ansible.cfg
Rename DEFAULT_VERBOSE to DEFAULT_LOGLEVEL

A more descriptive name of this variable since it isn't boolean in
nature, but degrees of verbosity and logging.
pep8 fixes
update .gitignore
update README and CHANGELOG for pending 0.2 release