Coerce include, embed, embed_ids

[zorbash]

Associations may be eagerly fetched as documented.

Current behavior for embed:

locations = client.shops(11).locations(embed: 'address')
address = locations.first.address
# => {"id"=>2, "street_number"=>"1", "street"=>"ΘΕΣΗ ΣΚΛΗΡΙ", "postcode"=>"19600", "city"=>"ΜΑΓΟΥΛΑ",
# "region"=>"Αττικής", "country"=>"Ελλάδα"}

address.class
# => Hash

Expected behavior:

locations = client.shops(11).locations(embed: 'address')
address = locations.first.address
# =>  #<Skroutz::Address id: 2, street_number: "1", street: "ΘΕΣΗ ΣΚΛΗΡΙ", postcode: "19600", city: 
# "ΜΑΓΟΥΛΑ", region: "Αττικής", country: "Ελλάδα">

address.class
# =>  Skroutz::Address