add a change-log of significant changes, sphinx style.
add a change-log of significant changes, sphinx style.

vmarkovtsev/django-haystackbrowser,vmarkovtsev/django-haystackbrowser,jannon/django-haystackbrowser,vmarkovtsev/django-haystackbrowser,jannon/django-haystackbrowser,jannon/django-haystackbrowser