Add Projects Team name to Alert-Mail subject
Revert "Add Projects Team name to Alert-Mail subject"

This reverts commit fe6816bca9f8b59a82c307bd93b1466728dfcde5.
Add mail:subject_prefix to project settings form
Set mail_subject_prefix form field to default value from sentry settings
Merge pull request #1084 from mortik/master

Make Email-Subject-Prefix editable for each Project