Validate if field exists in schema

[v1ctor]

Hi!
I would like to add new feature to validate if field exists in schema.

Schema schema = SchemaLoader.load(schemaAsJsonObject);
Assert.assertTrue(schema.hasField('rectangle.a'))

In first glance I think that I have to validate only propertySchemas recursievly and patternProperties.
Could you please point if there are some corner cases of this solution?

[v1ctor]

Hi @erosb You could close this task :)
Also could you please tell me when you will release new version of the library?

[erosb]

Hi! After merging your PR I recognized that your ObjectSchema#definesProperty() implementation handles escaping & recursion only for properties, but not for patternProperies and schemaDependencies. I started working on it. With some luck I will finish it tonight.

[erosb]

Okey, all looks fine, the new release is available on GitHub.
@balazs-zsoldos please deploy version 1.4.0 to maven central , thanks.