[ActiveRecord] `find_all()` should accept shorthand params for columns

[claudiopro]

Proposal for a shorthand syntax that relieves the caller from building a SQL query fragment. Today you'd do:

$products = $product_factory->find_all(array(
  'where_clause' => '`subcategory_id` = 1 AND `brand_id` = 2'
));

The desired syntax would be instead:

$products = $product_factory->find_all(array(
  'subcategory_id' => 1,
  'brand_id' => 2
));

The assumptions here are:

• The query always filters down, i.e. the columns are put in AND
• If the user passes where_clause, all shorthand column params are ignored.