Simplify TemplatedEmailMessage
Test body rendering
Test HTML body rendering
Test that template is optional when body is used
Allow body attribute to be a Django template
Test that body template is parsed
Allow subject attribute to be a Django template
Test that subject template is parsed
Update missing body handling
Test missing body error handling
Clean up html body rendering
Remove redundant test
Update README
Merge pull request #12 from hzdg/misc-updates

Misc Updates