added html response handler
- Only prettify xml response in DEBUG mode
- return xml as root
- added docstring
- only prettify html response in DEBUG mode
- added proper html tag (html, body and doctype)
Merge branch 'develop' of git://github.com/jiitoey/django-slumber into jiitoey-develop

Conflicts:
	slumber/server/xml.py
	slumber_examples/tests/__init__.py
	slumber_examples/tests/xml.py
Add html handler
Fix relative imported
Clean up test accept handler
Added test call html handler
Merge branch 'jiitoey-develop' into develop

Conflicts:
	slumber/server/accept_handler.py
	slumber/server/xml.py