Adds the ability to specify additional whitelist users from the command line

Replaces the manual parsing of whitelisted users from the command line with the OptionParser library.

Adds an a doc comment for the whitelisted users arg.

Point at project page on pypi. Change http links to https.

Bump version for 3.3 support and in order to make a signed tag/release.

Limit the travis status icon to just the master branch.

Apparently github and bitbucket lack some of the more obscure RsT
rendering options.

Update docs. Bump version.

Accept filenames used in Debian packaging.

According to the Debian packaging guides, files named debian/foo.cron.d will be installed as /etc/cron.d/foo. Files named debian/cron.d are also allowed - the cron.d file is given the package name in /etc/cron.d. For more info: http://www.debian.org/doc/manuals/maint-guide/dother.en.html#crond

In order to check these files during the packaging phase, files matching (\S+\.)?cron.d must be allowed.

At a later point it is probably a good idea to have these filename extensions enabled by flags. As the comment preceding the code alludes to, some names that run-parts would not accept are already allowed for another file deployment system.

I'll do that later after I review some other packaging system docs.

The chkcrontab script doesn't exit with the proper error code

Changes to make it easier to check some various code quality bits.

Also added some dist_clean dirs to remove and info on using coverage.

Fixed a number of pylint issues - many more to go.  Have to balance
pylint's config with the default Google style conventions.

Info on how to use tox.  Well, just telling people to run tox, not a
huge amount of info there.

Add pylint config file.  Clean up some pylint errors.  Clean up setup.py
and make it work with tox/pip.