* json schema array component should use schema to generate example in case of array items.
* empty value checkbox should be disabled if not empty => not empty list || not empty string
* curl should also check for not empty list
bug: JsonSchema components should validate schema properties exists
- schema
- type
- format
- enum
bug: fix a debounce error in JsonSchema_string if value is null
ft: new simplified JsonSchemaArrayItemText component
test: use immutableJS for `json-schema-form` test
test: add dev scripts to run `cypress open`
test: new cypress `schema-form` tests
