Generated markdown is incompatible with commonmark / React-Markdown

[cryptoquick]

The following input here:

Generates:

asdf asdf**asdf**_**asdfasdf asdf **_**asdf **adsf

via toString('markdown')

If this is input here:

http://spec.commonmark.org/dingus/

Or, if input as a source into react-markdown, it generates this:

HTML is:
<p>asdf asdf<strong>asdf</strong><em>**asdfasdf asdf **</em>**asdf **adsf</p>

[sstur]

I do believe this is a bug. It probably belongs on https://github.com/sstur/draft-js-export-markdown. I would be open to a pull request if you find a solution.

[seldomU]

What about this PR: sstur/draft-js-export-markdown#14
It looks like this would at least fix the whitespace related markdown problems.