Add hashCode implementations where there are none

[Sergio-Mira]

Fixes issues when using .hashCode for any node that contains either Boolean, Null, etc values

[cowtowncoder]

Makes sense, thank you for contribution.
I will be happy to merge it.

There is one practicality first, since this is your first contribution (I think?) to Jackson projects.
We need a Contributor License Agreement (CLA), from: https://github.com/FasterXML/jackson/blob/master/contributor-agreement.pdf
and once receiving it, can accept any and all contributions.

The common way to do this is to print CLA, fill & sign, scan and email to info at fasterxml dot com.
As soon as we receive it, I'll merge the patch.

Thank you again.

[Sergio-Mira]

I've sent the CLA, let me know if it looks good. Cheer!

[cowtowncoder]

Merged, backported in 2.6 for 2.6.3 as well.

Thank you again for this contribution -- it was an odd oversight that these were missing!

[Sergio-Mira]

Thanks for applying it so quickly! If we use 2.6.3 form maven the patch will be there? 💃

[cowtowncoder]

@Sergio-Mira yes, once we release 2.6.3 this will be part of it.