Add sms sender to service to be used in sms templates

in place of default numeric short code.

If not present default short code is used.

migrations/versions/0036_service_sms_sender.py

@@ -0,0 +1,28 @@
+"""empty message
+
+Revision ID: 0036_service_sms_sender
+Revises: 0035_notification_type
+Create Date: 2016-06-30 14:55:33.811696
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0036_service_sms_sender'
+down_revision = '0035_notification_type'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('services', sa.Column('sms_sender', sa.String(length=11), nullable=True))
+    op.add_column('services_history', sa.Column('sms_sender', sa.String(length=11), nullable=True))
+    ### end Alembic commands ###
+
+
+def downgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('services_history', 'sms_sender')
+    op.drop_column('services', 'sms_sender')
+    ### end Alembic commands ###