Add moviepy as optional dep for HQ thumbnails, make Pillow optional

[db updated]

alembic/versions/cfc972368e50_add_metadata_to_telegramfile.py

@@ -0,0 +1,35 @@
+"""Add metadata to TelegramFile
+
+Revision ID: cfc972368e50
+Revises: 501dad2868bc
+Create Date: 2018-03-09 16:07:01.236712
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = 'cfc972368e50'
+down_revision = '501dad2868bc'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table("telegram_file") as batch_op:
+        batch_op.add_column(sa.Column('size', sa.Integer(), nullable=True))
+        batch_op.add_column(sa.Column('width', sa.Integer(), nullable=True))
+        batch_op.add_column(sa.Column('height', sa.Integer(), nullable=True))
+        batch_op.add_column(sa.Column('thumbnail', sa.String(), nullable=True))
+        batch_op.create_foreign_key(constraint_name="fk_file_thumbnail",
+                                    referent_table="telegram_file",
+                                    local_cols=['thumbnail'],
+                                    remote_cols=['id'])
+
+
+def downgrade():
+    with op.batch_alter_table("telegram_file") as batch_op:
+        batch_op.drop_column('size')
+        batch_op.drop_column('width')
+        batch_op.drop_column('height')
+        batch_op.drop_column('thumbnail')