closeOnHover option is not in documentation and sample

[gfmartinez]

This was a very useful addition committed back in Dec 2015. Searched and searched for it, and it's not available easily. Neither is it available to test on the sample page at http://codeseven.github.io/toastr/demo.html
Does work in my code, so that's great!
Just wanted to make sure others who use toastr were aware.

[wcphart]

Its also not in the NPM version as of Jan 5 2017. For some reason NPM is at 2.1.2 and that feature is in 2.1.3

[john-sanders-2]

If the authors want to see this in the demo, I'll take a crack at it and submit a PR. Just let me know.