Remove #test_maker from TestMaker; it's moved to test_maker_container
module Maker -> class Maker
lang -> xml:lang
Add test/test_maker_publication.rb
[REFACTORING]Extract some code blocks from to method calls in Metadata
Extract more blocks to method calls
Bindings include ContentModel because of semantics
Add comments for #to_xml_attribute signature
[BUG FIX]mediaType@media_type -> mediaType@media-type
[REFACTORING]Use to_xml_attribute
Add mime-types to dependencies
Depend on local epub-parser at development environment
[WIP]Implement make_from_package_document method
Modify a test following implementation
Add more attributes to package elem
Fix a typo
Refactor make_from_package_document