Remove requestjs

[martinkooij]

Hi,

• I removed the dependency on the deprecated "request.js" module in favor of "node-fetch".
• I rewrote the fetcher towards using async/await; at the same time solving the existing issue of the module at times firing too many requests within a short time period to google when multiple destinations were specified (*).

Feel free to merge.
Martin

(*) Note: basically the existing foreach created a number of callbackfunctions that all fired to Google one after the other. With Debian and node.js now more efficient and my internet better at home it caused the Google API to protest. By using the async await in a loop, we wait for the answer first before going to the next request.