Fluent API for defining tables

[aeonblaire]

Can we add a fluent API for defining tables? I'd like to avoid using attributes.

[oysteinkrog]

I think that would be cool, PR's are welcome:)

[roygoode]

FYI I've contributed a Fluent API over on the original repo praeclarum#533 source: https://github.com/RoyGoode/sqlite-net