Json support hibernate4

[ilopmar]

First version of the json support for Hibernate 4

[ilopmar]

@Alotor. Please do not merge it yet.

I'm thinking about supporting both Map and JsonObject using ParameterizedType as you did with ArrayType. What do you think about it?

[Alotor]

To your question I don't think you should parametrize... maybe two different user types it's better.

One question. Which operations are you planning to support?

[coveralls]

Coverage decreased (-0.23%) when pulling a9cbfd6 on json_support_hibernate4 into 8a5243c on master.

[ilopmar]

I don't know which operators we should support. I have to read about json in Pg and do some tests. Do you have any suggestions?

I'll create a new UserType for JsonObject, update the documentation and do a push -f to this branch.

[Alotor]

http://www.postgresql.org/docs/9.3/static/functions-json.html

Maybe we can use these functions to implement "has field" and "contains" (only to check if a field has a specific value)

[ilopmar]

Ok, I'll try it :-)

[ilopmar]

@Alotor ready to merge if you want it. Then I'll release 4.1.0 and backport the changes to 3.x branch.

[coveralls]

Coverage decreased (-0.13%) when pulling ed7470f on json_support_hibernate4 into 8a5243c on master.

[Alotor]

Great! looks awesome :)