Working permissions and all tests passing.

Remove print statements.

Fix for review comments.

migrations/versions/0027_add_service_permission.py

@@ -0,0 +1,42 @@
+"""empty message
+
+Revision ID: 0027_add_service_permission
+Revises: 0026_add_sender
+Create Date: 2016-02-26 10:33:20.536362
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0027_add_service_permission'
+down_revision = '0026_add_sender'
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+def upgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('permissions',
+    sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
+    sa.Column('service_id', postgresql.UUID(as_uuid=True), nullable=True),
+    sa.Column('user_id', sa.Integer(), nullable=False),
+    sa.Column('permission', sa.String(length=255), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.ForeignKeyConstraint(['service_id'], ['services.id'], ),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('service_id', 'user_id', 'permission', name='uix_service_user_permission')
+    )
+    op.create_index(op.f('ix_permissions_service_id'), 'permissions', ['service_id'], unique=False)
+    op.create_index(op.f('ix_permissions_user_id'), 'permissions', ['user_id'], unique=False)
+    op.drop_column('users', 'permissions')
+    ### end Alembic commands ###
+
+
+def downgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('users', sa.Column('permissions', postgresql.ARRAY(VARCHAR()), autoincrement=False, nullable=True))
+    op.drop_index(op.f('ix_permissions_user_id'), table_name='permissions')
+    op.drop_index(op.f('ix_permissions_service_id'), table_name='permissions')
+    op.drop_table('permissions')
+    ### end Alembic commands ###