Add support for returning all possible mime types by magic.

lib/mimemagic.rb

@@ -107,7 +107,7 @@ class MimeMagic
   end
 
   def self.magic_match(io, method)
-    mime_or_mimes = if io.respond_to?(:seek) && io.respond_to?(:read)
+    if io.respond_to?(:seek) && io.respond_to?(:read)
       io.binmode
       io.set_encoding(Encoding::BINARY) if io.respond_to?(:set_encoding)
       MAGIC.send(method) { |type, matches| magic_match_io(io, matches) }
@@ -116,7 +116,6 @@ class MimeMagic
       str = str.force_encoding(Encoding::BINARY) if str.respond_to?(:force_encoding)
       MAGIC.send(method) { |type, matches| magic_match_str(str, matches) }
     end
-    method == :find ? [mime_or_mimes] : mime_or_mimes
   end
 
   def self.magic_match_io(io, matches)