Add example YAML for loggerconfig option

It's really difficult to find documentation on what needs to be in the optional ini, yaml, or json files.
This snippet comes out of the test case from the source code.

It should, at least, give people a place to start when using this option.
Remove unnecessary YAML document separator.
Add pyyaml as a requirement.

The ability to use YAML files for logger configuration requires this module.
Not including it causes confusion for people trying to use that new functionality.

Cheers!
Mike
Merge pull request #833 from eikonomega/patch-1

Add pyyaml as a requirement.
Merge pull request #827 from eikonomega/patch-1

Add example YAML for loggerconfig option
moved to an org
changed org name
yahoo changed its url
Update CONTRIBUTORS.txt

Adding myself per note from Tarek for recent updates regarding using YAML for logging configuration.
Merge pull request #836 from eikonomega/patch-2

Update CONTRIBUTORS.txt
Update badges and links in readme
Merge pull request #845 from josegonzalez/patch-1

Update badges and links in readme
Typo fix.
Merge pull request #849 from zenbum/patch-1

Typo fix.
Merge remote-tracking branch 'upstream/master' into feature/fix-rlimits-addwatcher