Updated config example so that it shows how to refer non-boolean values

Also changed `config.ignore_unknown_tags`, since the doc previously states it's called `config.unknown_tags`
Merge pull request #36 from jesperronn/master

Updated config example so that it shows how to refer non-boolean values
Proper handling of non breaking space

The bug I'm fixing with this is parsing of "<em>feelings:&nbsp;</em>". Non breaking space either needs to be removed, or preserved as HTML entitity. They are converted to whitespace instead.

Since it is a specific none breaking character, I think it's better to preserve it as that is the intention. However it could be added as a configuration option.
Merge pull request #37 from danschultzer/master

Proper handling of non breaking space
Lets treat all \u00A0 as &nbsp;

see #37
Merge remote-tracking branch 'upstream/master'

Conflicts:
	spec/components/paragraphs_spec.rb