port mysql_example to PostgreSQL
Merge pull request #12 from dmkoch/pgsql_big_dedupe_example

port mysql_example to PostgreSQL
Add instructions for pgsql big dedupe example
Merge pull request #13 from dmkoch/master

Add instructions for pgsql big dedupe example
Adding psycopg2 to requirements
Add unidecode to requirements.txt
mysql now calls sample method
remove sampling function
simplify indexed business, utf8 charset
not random records
do freezing on dictionary creation
remove doc html
remove doc html
drop frozendict and delete temp_d when done
Merge pull request #15 from datamade/sampling

Sampling
update sampling in pgsql big example
update docs