Add support for HTML Entities

[layxyer]

I crawled some html data, “&nbsp” used for content layout, but it seems that the plugin does not support "&nbsp".

[Sub6Resources]

Good catch! Yes, this plugin should definitely support   as well as the other named html entities (e.g. ©   < > to name a few). I've renamed this issue to be a bit more general to cover all those cases as well.

[erickok]

This should work now:

<p>Let's &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; try this!</p>