Support for allOf, anyOf and oneOf

[ottok]

JSV does not seem to support all keywords for any instance type. I tested some and grepped the sources for these keywords, and didn't find anything, so I guess they are simply not implemented.

See
5.5.3. allOf
5.5.4. anyOf
5.5.5. oneOf

at
http://json-schema.org/latest/json-schema-validation.html#anchor75

It would be cool if these were included too.

Thanks!

[fiddur]

This would be included in #73 (supporting draft 04).

[ebdrup]

I've compiled a list of the official draft-4 tests that are failing for JSV here
https://github.com/Muscula/json-schema-benchmark/blob/master/reports/JSV.md

If you want draft-4 support perhaps take a look here for an alternative:
https://github.com/Muscula/json-schema-benchmark