[WiP] rename project from Caravel to Superset (#1576)

* Change in files

* Renamin files and folders

* cleaning up a single piece of lint

* Removing boat picture from docs

* add superset word mark

* Update rename note in docs

* Fixing images

* Pinning datatables

* Fixing issues with mapbox-gl

* Forgot to rename one file

* Linting

* v0.13.0

* adding pyyaml to dev-reqs

superset/migrations/versions/3c3ffe173e4f_add_sql_string_to_table.py

@@ -0,0 +1,22 @@
+"""add_sql_string_to_table
+
+Revision ID: 3c3ffe173e4f
+Revises: ad82a75afd82
+Create Date: 2016-08-18 14:06:28.784699
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '3c3ffe173e4f'
+down_revision = 'ad82a75afd82'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.add_column('tables', sa.Column('sql', sa.Text(), nullable=True))
+
+
+def downgrade():
+    op.drop_column('tables', 'sql')