Updates to template endpoints:

- moved into templates rest class
- updated dao
- removed delete methods
- constraint on subject line

migrations/versions/0020_email_has_subject.py

@@ -0,0 +1,26 @@
+"""empty message
+
+Revision ID: 0020_email_has_subject
+Revises: 0019_unique_servicename
+Create Date: 2016-02-18 11:45:29.102891
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0020_email_has_subject'
+down_revision = '0019_unique_servicename'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.create_check_constraint(
+        "ch_email_template_has_subject",
+        "templates",
+        "((template_type='email' and subject is not null) or (template_type!='email' and subject is null))"
+    )
+
+
+def downgrade():
+    op.drop_constraint('ch_email_template_has_subject', 'templates', type_='check')