Feature: add createASCII method

[ahwayakchih]

Hi,

This re-applies ASCII output feature from #6. It does not change existing code, it just adds new method.

I use ASCII output in command line tools/scripts :).

Changes:

• Added createASCII method that outputs QR code rendered using ASCII blocks.
• Added JS development dependency on mocha to run new tests for basic GIF and ASCII output.

UPDATE: below is a screenshot of how it looks in terminal :).

Regards

[nayuki]

Two problems:

• You named the method createASCII(), but the block characters are in Unicode.
• How do you account for the fact that some text terminals are white-on-black, and some are black-on-white?

[ahwayakchih]

@nayuki thanks for comment. You're right that it's actually Unicode. We can rename the method, e.g., "createUnicode" or call it something else. I was going for reminding about "ASCII drawing", but it looks that i was wrong. Any ideas how to name it better?

It returns a string, it's up to the caller to style it with control sequences in terminal, or CSS in web browser.

[kazuhikoarase]

I was going for reminding about "ASCII drawing",

I agree.

Thanks a lot!

[ahwayakchih]

Thanks :).