create-table --ignore and --replace, refs #27

docs/cli.rst

@@ -399,6 +399,8 @@ You can specify foreign key relationships between the tables you are creating us
                 [author_id] INTEGER REFERENCES [authors]([id])
              )
 
+If a table with the same name already exists, you will get an error. You can choose to silently ignore this error with ``--ignore``, or you can replace the existing table with a new, empty table using ``--replace``.
+
 .. _cli_add_column:
 
 Adding columns

docs/python-api.rst

@@ -262,6 +262,8 @@ The first argument here is a dictionary specifying the columns you would like to
 
 This method takes optional arguments ``pk=``, ``column_order=``, ``foreign_keys=``, ``not_null=set()`` and ``defaults=dict()`` - explained below.
 
+You can pass ``ignore=True`` to silently ignore an existing table and do nothing, or ``replace=True`` to replace that table with a new, empty table.
+
 .. _python_api_compound_primary_keys:
 
 Compound primary keys