Adding handler for definitions and internal $refs.

[ocschwar]

This simple change populates the schemaMap with a copy of a definition where ever one is referred to with a $ref.

[idelvall]

Hi Omri,
could you add an example to index.html showing the new functionality?
Thanks!

[ocschwar]

Done.

Also, my fork now has a handler for patternProperties too, as well as greying out for elements marked readOnly. (basic types are greyed out, and array types marked as "readOnly" have the addButton and removeButtons greyed out. Not sure how or whether to do the same with objects and one's.

[idelvall]

Hi Omri, excuse the delay, I have been very busy lately... First of all thank you for your contributions!
I am working on it now

[idelvall]

Hi Omri, I've just merged your PR.
I did some minor refactoring so you should merge your code to align ourselves.

The readonly implementation (http://brutusin.org/json-forms/#12) seems to be unfinished. Shouldn't the input values be also disabled? I think so.

I open a new issue for it
#26