Add awesome JSON editor!

src/components/layers/LayerEditor.jsx

@@ -1,5 +1,6 @@
 import React from 'react'
 
+import JSONEditor from './JSONEditor'
 import SourceEditor from './SourceEditor'
 import FilterEditor from '../filter/FilterEditor'
 import PropertyGroup from '../fields/PropertyGroup'
@@ -126,6 +127,10 @@ export default class LayerEditor extends React.Component {
         groupFields={fields}
         onChange={this.onPropertyChange.bind(this)}
       />
+      case 'jsoneditor': return <JSONEditor
+        layer={this.props.layer}
+        onChange={this.props.onLayerChanged}
+      />
       default: return null
     }
   }