Possibility of specifying additional html attributes to 'wrap'
Merge pull request #899 from remofritzsche/master

Possibility of specifying additional html attributes to 'wrap'
Support additional attributes to custom wrapper tag.

We are using the html option on wrapper because the wrapper has some
options that are not related to html attributes.

Now you can for example:

```ruby
config.wrappers do |b|
  b.wrapper :tag => :td, :class => :some_class, :html => { :additional_html_attribute => :value }
end
```

Thanks @remofritzsche @rafaelfranca @bellthoven
Add a changelog entry about the html option to custom wrappers.
Add an entry to README showing the possibility to add additional html attributes to custom wrappers.
Merge branch 'master' into ua-html-options

Conflicts:
	CHANGELOG.md
Merge pull request #998 from plataformatec/ua-html-options

Possibility of specifying additional html attributes to 'wrap'