Adding possibility to configure fields in the template based on their widget class.
Prevent 'object' of beeing a valid ancestor of a form field or widget. The name 'object' might clash with a field name.
Improving the documentation for the {% formconfig field ... %} template tag and adding docs about the ability to filter by the widget's class name.
Merge pull request #69 from gregmuellegger/formconfig-widget

{% formconfig field ... for "<widget class name here>" %}