#43 hide a field / added HiddenWidget

[HelloLudger]

Added HiddenWidget and hide HiddenFields by adding display: none to Wrapper within SchemaFields.js.

Sorry, no tests. Couldn't get the tests to run, in addition to my 0-knowledge of testing.

[n1k0]

Nit: uiSchema["ui:widget"] === "hidden" is good enough

[n1k0]

We definitely want tests and documentation updated here. What prevents you running them? What error are you getting?

[HelloLudger]

Maybe the problem is that I use Windows. I don't know. When I start npm test the error says that the command "NODEv_ENV" is not a viable command.

C:\Projekte\react-jsonschema-form>npm test

> [email protected] test C:\Projekte\react-jsonschema-form
> NODE_ENV=test mocha --compilers js:babel/register --recursive --require ./test/setup-jsdom.js $(find test -name '*_test.js')

Der Befehl "NODE_ENV" ist entweder falsch geschrieben oder
konnte nicht gefunden werden.
npm ERR! Test failed.  See above for more details.

[n1k0]

Superseded by #111.