Make it an NPM package.

[dwjohnston]

Addresses: #42

Changes:

• I've moved the core of the logic out to stix2viscore.js. Retain stix2vis for compatibility with what you already have.
• Adds a package.json
• Adds linting - I mostly added this to help me remove all the non-strict js.
• Adds typescript as a dependency - I'm using TypeScript to compile - but currently I haven't added types, but this would be a very nice feature feature.
• Add package scripts (allow you to see the browser, build command)

Notes

Re: the use of requirejs, and the "nbextensions" stuff - I don't really know what I'm doing there - but what I've got looks like it's working.

Possible bug

Take a look at that handleSelected in stix2viscore.js - it looks like it is never defined anywhere.

Worth discussing

• Should the PNG be included in the package?
• With putting all of the code in stix2viscore.js you will lose your commit history. Possibly better to put the Jupyter stuff in a different file.
• no-prototype-builtins - I just disabled the rule - is this something worth fixing? https://eslint.org/docs/rules/no-prototype-builtins

Testing

I tested that it works as an npm package here:

https://github.com/dwjohnston/stix-vis-test

Follow the instructions there.

Things that need to be done before this PR is merged:

• Update the package.json
  • Rename name
  • Repository
  • Author
  • License
• Update the readme
  • Address TODOS
  • Include installation instructions
  • (Because you might as well) - Include example usage in react

Future improvements:

• Add types