remove rendering from schema & make it expressive (#1262)

* split rendering out of schema

* remove default components

* first stab at new schema

* make default normalizations smarter

* revert to forcing defaults to be verbose?

* refactor reason constants

* split nodes into blocks/inlines

* get tests passing

* restructure schema tests

* add parent test

* cleanup

* remove defaults from schema

* refactor schema rule.nodes validation, update example

* embed schema in state objects

* fixes

* update examples, and fixes

* update walkthroughs

* update docs

* remove old schemas doc page

* add more tests

* update benchmarks

examples/plain-text/index.js

@@ -40,11 +40,13 @@ class PlainText extends React.Component {
 
   render() {
     return (
-      <Editor
-        placeholder="Enter some plain text..."
-        state={this.state.state}
-        onChange={this.onChange}
-      />
+      <div className="editor">
+        <Editor
+          placeholder="Enter some plain text..."
+          state={this.state.state}
+          onChange={this.onChange}
+        />
+      </div>
     )
   }