Implement Array.prototype.length

We don't have a real Array.prototype of course, just `[1,2,3].length`
behaves like we do.

PUBLISHED_FROM=456379377652cb60fc6f9521d8d358480237c58a

README.md

@@ -12,7 +12,7 @@ Mongoose makes embedded network programming fast, robust, and easy.
 
 Looking for a complete IoT firmware solution?
 
-Check out [Mongoose OS](https://mongoose-iot.com) - open source embedded operating system for low-power connected microcontrollers. Secure, designed for Internet of Things, complete environment for prototyping, development and managing.
+Check out [Mongoose OS](https://mongoose-os.com) - open source embedded operating system for low-power connected microcontrollers. Secure, designed for Internet of Things, complete environment for prototyping, development and managing.
 
 # Support
 - [Study mongoose example code](https://github.com/cesanta/mongoose/tree/master/examples)