Add reactified event markers to timeline

src/components/TimelineMarkers.jsx

@@ -0,0 +1,27 @@
+import React from 'react';
+
+class TimelineMarkers extends React.Component {
+
+  renderMarker(event) {
+    return (
+      <circle
+        className="timeline-marker"
+        cx={this.props.getEventX(event)}
+        cy={this.props.getEventY(event)}
+        r="10"
+        style={{ opacity: "0.9" }}
+      >
+      </circle>
+    )
+  }
+
+  render () {
+    return (
+      <g>
+        {this.props.selected.map(event => this.renderMarker(event))}
+      </g>
+    );
+  }
+}
+
+export default TimelineMarkers;