Always set configKeyName on connections.

This is useful in fixtures for figuring out where a fixture was added.
This property will hopefully be removed, but for now it is a necessary
crutch.
Add stub method for reseting sequences.

This method needs to be implemented, but first sequence reflection needs
to be implemented in schema + postgres.
Update create + insert methods.

Update methods + tests for creating and inserting fixture records.
Add dropTableSql()

Add tests for MysqlSchema + Table.
Add dropTableSql to Postgres.
Add dropTableSql to Sqlite.
Rename methods on Table class.

The word Table is redundant in these methods.
Update dropTableSql methods to return an array of queries.

This makes this method consistent with the createSql method, and
the upcoming truncateSql methods.
Add table truncation for sqlite + mysql

Fixtures need to be able to truncate tables, we'll need this code
for that.
Very naive implementation of table truncation with postgres.

I'm fairly certain that sequence names will need to be generated/handled
as the auto generated names are very unlikely to be the names given
to addConstraint()
Update TestFixture and implement truncate() with new code.