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

Possibility of specifying additional html attributes to 'wrap'
We are green :green_heart:
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 boolean_label_class config

This config is to make possible to change the class of the label that
wrap the input in a boolean input.

Before this change we always use 'checkbox'. Now the default is still
'checkbox' but it can set to nil
Fix typo
Merge pull request #999 from plataformatec/rm-boolean-label-class

Add boolean_label_class config
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'
Improve README.
Merge pull request #1000 from tgxworld/doc_fix

Improve README.
Merge remote-tracking branch 'origin/master' into rm-wrapper-classes

Conflicts:
	CHANGELOG.md
	lib/simple_form/inputs/boolean_input.rb