feat(auth): implement user authentication system

backend/node_modules/fast-safe-stringify/CHANGELOG.md

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+# Changelog
+
+## v.2.0.0
+
+Features
+
+- Added stable-stringify (see documentation)
+- Support replacer
+- Support spacer
+- toJSON support without forceDecirc property
+- Improved performance
+
+Breaking changes
+
+- Manipulating the input value in a `toJSON` function is not possible anymore in
+  all cases (see documentation)
+- Dropped support for e.g. IE8 and Node.js < 4