Add config options to generate Joda LocalDate and LocalTime

[brentsowers1]

There is a really useful feature currently in place where the generated class property will be LocalDateTime when the JSON schema type is string with format of date-time (implemented in https://github.com/joelittlejohn/jsonschema2pojo/blob/a0797e0878dc46f174b64643bc09655b22983afb/jsonschema2pojo-core/src/main/java/org/jsonschema2pojo/rules/FormatRule.java). I'd like to propose generating a LocalDate when the format is date, and LocalTime when the format is time. I see date and time listed in that file explicitly being set to a type of string, so I am guessing that this was thought about at at least some point?

If you think this is a good idea I will take care of implementing it and issuing a pull request, I just wanted to propose it here to make sure it makes sense before starting work.

For the implementation, I would follow the pattern that has been implemented for date-time. I'd add a new config flag for whether or not to use Joda LocalDate and LocalTime (separate from the current flag for whether to use Joda DateTime), defaulting to false.

[joelittlejohn]

Hi Brent. This sounds like a good addition, thanks for raising this. Happy to accept a pull request along the lines you have suggested (useJodaLocalDates).

I assume the Joda serializer for Jackson can support LocalDate and LocalDateTime?

[joelittlejohn]

Closed by #300