Following error happens when trying to get zipped archive:

s = Chemcaster::Service.connect 'email', 'password'
s.registries[0].archives[0]
RuntimeError: No such media type: application/zip

from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/media_type.rb:5:in `representation'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/link.rb:10:in `initialize'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/representation.rb:62:in `new'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/representation.rb:62:in `load_hash'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/representation.rb:61:in `each'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/representation.rb:61:in `load_hash'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/item.rb:18:in `load_hash'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/representation.rb:13:in `initialize'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/link.rb:38:in `new'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/link.rb:38:in `do_http'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/link.rb:15:in `get'
from /usr/lib/ruby/gems/1.8/gems/chemcaster-0.4.0/lib/chemcaster/index.rb:17:in `[]'
from (irb):4

API is at 0.4.0. Gem needs to be at 0.4.0 or higher.