added write support via rest.

Author: Morgul

lib/fslib.browser.js

@@ -28,7 +28,22 @@ function readDB(path)
 
 function writeDB(path, jsonStr)
 {
-    return Promise.reject(new UnsupportedInBrowserError('writeDB()'));
+    return fetch(path, {
+            method: 'POST',
+            mode: 'cors',
+            headers: { 'Content-Type': 'application/json' },
+            body: jsonStr
+        })
+        .then((data) => data.json())
+        .catch((err) =>
+        {
+            const error = new Error(`Failed to post to '${ path }'.`);
+            error.innerException = err;
+            error.code = 'ERR_POST';
+
+            console.error(err);
+            throw error;
+        });
 } // end writeDB
 
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