Improvements for Bootstrap 3.0 support. Includes:

- Fixed problem with inputs of type file, that were displayed inside an input text element
- Added support for Django Form `required_css_class` and `error_css_class`
- Added CSS class `multiple-checkbox`, to be used to easily hide `<li>` elements in multiple checkboxes from your styles file
Added last updates from upstream
added some build created dirs to .gitignore
Merge branch 'eureka' of https://github.com/caumons/django-bootstrap-form into caumons-eureka

Conflicts:
	.gitignore