Add PropertyNameStrategy KEBAB_CASE

[danielmischler]

With json api (jsonapi.org) as a possible standard way to exchange json data between applications it would be great to have its recommended property naming strategy added to jackson:
http://jsonapi.org/recommendations/#naming
http://guides.emberjs.com/v2.1.0/models/customizing-serializers/#toc_json-api-document

It seems to be CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES just with underscores replaced by dashes :-)

[cowtowncoder]

I think this is what was dubbed somewhere as "kebab-case"? (https://en.wikipedia.org/wiki/Snake_case).
Sounds reasonable.

There was also a brief discussion on dev list about renaming existing choices (or, rather, adding new replacements, deprecating existing ones), so maybe worth mentioning there.