Unsupported type warnings

[sirupsen]

If there's a type we don't support, e.g. polygon, we should print a warning that we are coercing it to a string and it may not work if it's across databases.

[erezsh]

We already do that here:

data-diff/data_diff/diff_tables.py

Line 353 in 75b8c5d

logger.warn(