Primary key coming first for MySQL
Now, compound Primary Keys are also rendered in order on MySQL create table script.
Added test for MySQL ordering PK-first.
Improved readability and consistency of README.md
Added PK ordering support for Postgres.
Moved PK logic to CommonSQL base class.
Added PK ordering for SQLite.
Added tests for SQLite PK ordering.
Merge pull request #16 from nicholasamorim/master

Added PK ordering on SQL dumping