update Bootstrap docs URL in comment
Merge pull request #106 from cvrebert/patch-1

update Bootstrap docs URL in comment
Add correct for attribute to label tag

When rendering a field, fill the 'for' HTML attribute correctly.

Fixes issue #107
Populate the for="id_*" attributes of labels.
Merge pull request #109 from rcmachado/label_for_bugfix

Add correct "for" attribute to "label" tags
Merge pull request #110 from suriya/develop

Populate the for="id_*" attributes of labels.
Allow global and template setting for form_required_class and form_error_class (styling belongs in templates)
Fixed class/variable names and added test
Preparing 4.3.0
Merge branch 'release/4.3.0'