Add support for 'pass through' column info

[brweber2]

This would enable db specific column info. For example, on a table create:

db.createTable( 'name', {
id: { type: 'uuid',
passthrough: true,
primaryKey: true
}
}

If an unrecognized type is found and passthrough is not explicitly set to true, you could throw an error. If passthrough is true, just write out the value to a string and try to execute the sql...

This would enable me to maintain my table info in a consistent, declarative manner instead of having to sometimes drop down to executing full blown native sql queries.

[kunklejr]

What do you think about the idea of simply passing an unknown data type through unchanged but logging a warning when doing so?

[brweber2]

I'm fine with that way too. I basically want a workaround for db specific DDL/DML.

I certainly don't like the verbose 'passThrough' key, but I was struggling to find an appropriate name, so maybe the warning is the way to go.

[kunklejr]

Unknown data types are simply passed through unchanged with an accompanying warning message. See commit 2936b44 for the change.