feat(auth): implement user authentication system

backend/node_modules/is-property/README.md

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+is-property
+===========
+Tests if a property of a JavaScript object can be accessed using the dot (.) notation or if it must be enclosed in brackets, (ie use x[" ... "])
+
+Example
+-------
+
+```javascript
+var isProperty = require("is-property")
+
+console.log(isProperty("foo"))  //Prints true
+console.log(isProperty("0"))    //Prints false
+```
+
+Install
+-------
+
+    npm install is-property
+    
+### `require("is-property")(str)`
+Checks if str is a property
+
+* `str` is a string which we will test if it is a property or not
+
+**Returns** true or false depending if str is a property
+
+## Credits
+(c) 2013 Mikola Lysenko. MIT License