field_class does nothing.

[dsluo]

field_class is documented as an option for the bootstrap_field template tag, but it currently is not used, and does not apply the class to the <input>.

[lsmith2-edison]

This can be fixed by adding the following to the add_widget_class_attrs() function within the renderers.py file:

field_classes = [text_value(self.field_class)]

Then append "+ field_classes" to the second to last line of the function:

classes = before + classes + field_classes

This solution is working for me. If there aren't any issues with it, I think it this should be merged into the official code.