[ALOY-447] Alloy Models should have 'autoincrement' option for primary keys

exports.definition = {
    config: {
        columns: {
            myId: 'INTEGER PRIMARY KEY AUTOINCREMENT',
            col2: 'TEXT'
        }
    },
    adapter: {
        type: 'sql',
        collection_name: 'myTable',

        // tells Alloy _not_ to auto create a unique id column and 
        // to use this column for Backbone syncing instead
        idAttribute: 'myId'   
    }
};