Migration to HTML email - part one
Fixed leftovers. Added html email templates
Added tests for html emails
When `USERENA_HTML_EMAIL = False` use of plain text templates is enforced
If both plain text and html bodies are empty `send_mail` raise an exception
New tests documentation and cleanup
Documentation for new settings
If html email template fails, plain text template use is enforced
Added html2text to dependencies
Fix context for reset password view
Merge branch 'master' into nephila-feature/html_email_1.2.2

Conflicts:
	userena/settings.py
Bump version.
Merge branch 'master' of github.com:bread-and-pepper/django-userena