Import threading library in tail manager since we want to use it
Merge pull request #203 from chrisroberts/bugfix/lost-import-in-rebase-madness

Import threading library in tail manager since we want to use it
dont add empty object to input list
Merge pull request #206 from tommyulfsparre/skip-empty-input-object

Don't append empty strings
Python 2.6 ConfigParser does not handle non-string
Fixed typo
Merge pull request #208 from tommyulfsparre/remove-non-string

Remove non string
`StrictRedis.from_url` is better than DIY-ing it

Note currently `fakeredis` doesn't support `from_url` - this is blocking
on https://github.com/jamesls/fakeredis/pull/29 being merged in (I've
bumped version requirement in `tests.txt` accordingly)