2.1.0 WIP - Githubissues

Summary of changes:

[x] changed homepage URL to use HTTPS
[x] fixed #55 by bundling babel-runtime into distribution files to support older runtime environments
[x] updated build system to use unified code styles via ESLint and to support older runtime environments progressively
[x] explicitly added canvas as external module for rollup config
[x] resolved #44 by adding ability to define padding for QR code

neocotic / qrious