Move example files to src.

I don't remember why I put these in FastImage in the first place.

ReactNativeFastImageExample/src/withCacheBust.js

@@ -0,0 +1,28 @@
+import React, { Component } from 'react'
+import uuid from 'uuid/v4'
+
+export default BaseComponent => {
+    class WithCacheBust extends Component {
+        state = { bust: '?bust' }
+
+        onPressReload = () => {
+            // Force complete re-render and bust image cache.
+            const key = uuid()
+            const bust = `?bust=${key}`
+            this.setState({ bust })
+        }
+
+        render() {
+            return (
+                <BaseComponent
+                    bust={this.state.bust}
+                    onPressReload={this.onPressReload}
+                />
+            )
+        }
+    }
+
+    WithCacheBust.displayName = `withCacheBust${BaseComponent.displayName}`
+
+    return WithCacheBust
+}