Fix: Circular reference detected error

[bratomes]

Problem

I got the error ValueError: Circular reference detected when trying to get a Record instance representation of records lib.

Solution

My table has a uuid type field. This type is not JSON serializable, so needs to be handled (converted to str).

Maybe this fix kennethreitz/records#95.

Error scenario

Create database with a uuid field

create table bar (                                                      
    id serial primary key,
    foo_id uuid
);

Insert data

insert into bar (foo_id) values ('30fcb0c7-a836-446c-9c88-411800c0c818')

Use records lib and get the error

In [1]: import records
In [2]: db = records.Database('postgres://...')
In [3]: rows = db.query('select * from bar')
In [4]: rows[0]
...
ValueError: Circular reference detected

[dschep]

Hey @kennethreitz, any chance of this change being released to PyPI?