attempt to resolve multiple issues

[timelyportfolio]

I was so excited to see on Twitter that you wrapped jExcel as an htmlwidget. You did a great job, but as I played a little bit, I discovered a couple issues. Sorry to wrap this in one pull request and assume that all of my concerns are valid. Please let me know if easier to separate these out into multiple smaller isolated pulls.

List of changes:

1. Add NEWS.md to track changes in future versions and start a notification of the changes in this pull request.
2. Rewrite JavaScript in old form to work with older RStudio versions timelyportfolio@89efcb8 rewrite in es5 JavaScript to work in older RStudio #3
3. Allow passing of many logical arguments to the widget if FALSE timelyportfolio@7eee384 pass logical arguments to widget #4
4. Add more examples timelyportfolio@3d50cce
5. Begin to add tests timelyportfolio@2d49af5 test package #5