Widget fixes (#162)

* Make string the default widget if none is specified

* Linting fixes for PreviewPane

* Linting fixes for ControlPane

* Add date widget

* Fix name of date control class

* Fix spaces in list control with no fields

* Fix linting error for List Control

* Fix linting errors in raw editor

* Add Select widget

* Fix linting error

src/index.js

@@ -39,3 +39,26 @@ for (const method in registry) {
 }
 window.createClass = React.createClass;
 window.h = React.createElement;
+
+const buildtInPlugins = [{
+  label: 'Image',
+  id: 'image',
+  fromBlock: match => match && {
+    image: match[2],
+    alt: match[1],
+  },
+  toBlock: data => `![${ data.alt }](${ data.image })`,
+  toPreview: (data) => {
+    return <img src={data.image} alt={data.alt} />;
+  },
+  pattern: /^!\[([^\]]+)\]\(([^\)]+)\)$/,
+  fields: [{
+    label: 'Image',
+    name: 'image',
+    widget: 'image',
+  }, {
+    label: 'Alt Text',
+    name: 'alt',
+  }],
+}];
+buildtInPlugins.forEach(plugin => registry.registerEditorComponent(plugin));