Template syntax validation for EmailTemplate fields
Adds test for template syntax validation
Merge branch 'templatesyntax' of github.com:wadevries/django-post_office into templatesyntax

Conflicts:
	post_office/tests/models.py
Fixes header setting when sending through post_office.EmailBackend
Merge pull request #18 from wadevries/headerfix

Fixes header setting when sending through post_office.EmailBackend. Thanks @wadevries!
Update AUTHORS.rst
Merge pull request #17 from wadevries/templatesyntax

Template syntax validation for EmailTemplate fields
Merge branch 'master' into all

Conflicts:
	post_office/tests/models.py