add foundation styling to button elements
Add FormType for button-groups
adds a FromType for button-groups, altered the templates accordingly

Conflicts:
	Resources/views/Form/foundation_form_div_layout.html.twig
add the actual form type...
check if class attribute is defined
update documentation to explain the buttongroup type
revert old form layout
indentation fixes
indentation fixes
update readme with how to add behavior to buttons
add support for button bars
indentation fix
Merge pull request #12 from Prezent/2.0-button-mania

Added support for buttons