Template syntax validation for EmailTemplate fields
Adds test for template syntax validation
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
WIP parallelized email sending.
First seemingly working implementation of parallel sending.
Added a workaround for Travis multiprocessing issue.
Moved logic for getting emails to be sent to mail.get_queued().
Update README.rst
Update README.rst
Added -p or --processes option to send_queued_mail management command.
Updated README.
Merge branch 'master' of github.com:ui/django-post_office into parallel-send

Conflicts:
	README.rst
Added deprecation warning to Email.objects.from_template.
Fixed styling of bulleted list in README.