Fix 500 when deleting mobile numbers
this fixes the smtp credential issues where emails auto default to use settings.

however with using email services like SES, the SMTP login might not be a valid email address so it fails hard.

following examples from feature fix for django password reset from_email fixes (https://github.com/django/django/commit/4084bc7354), able to add new settings to auto default reply to.

first commit to merged hq codebase!
updating default notification email to use the settings set one, not EMAIL_LOGIN or EMAIL_HOST_USER
moving and grouping email addresses together
setting email_from in send_HTML_email calls
fixing kwarg error, formatting
Merge branch 'master' into delete_phone_500
remove line
Correct issues with fix for deleting phone numbers

Response to comments on pull request
https://github.com/dimagi/commcare-hq/pull/224
Merge branch 'master' into delete_phone_500
Use correct return type for get_time_zone()
Merge pull request #232 from dimagi/email_notifications

this fixes the smtp credential issues where emails auto default to use s...
Merge pull request #224 from dimagi/delete_phone_500

Fix 500 when deleting mobile numbers
update submodule refs to formdesigner/add-question-redesign and hqstyle/vellum-font
Merge branch 'staging2' of github.com:/dimagi/commcare-hq into staging2
Merge branch 'master' of github.com:/dimagi/commcare-hq into staging2