Small setup updates.

Adding a setup.cfg file
Adding pytest support to setup.py
Adding redshift create table special syntax.

Adding diststyle support.
Adding distkey support.
Adding sortkey support.
Adding encode support.
Adding redshift create table special syntax.

Adding documentation
Adding redshift create table special syntax.

Python 3 fix.
Merge pull request #12 from aronkyle-lightspeedretail/Adding-DDL-Support

Adding ddl support for redshift special syntax