[BUG FIX]Make #parse_xxx accept argument
Remove namespace
[REFACTORING]Define predicate methods by define_method
Introduce UnsupportedRenditionLayout exception
Add more detailed comments
Add CHANGELOG file to YARD documentation
Update changelog
Add tests for rendition:layout-xxx properties of Itemref
Initialize @properties as empty Array on Itemref
Extract method definition block to RenditionLayout module
ItemrefMixin extends RenditionLayout module
Add comments to Itemref#rendtion_layout=
Add Package#using_fixed_layout?
Rename: RenditionLayout -> Rendition
Alias layout as rendition_layout
Make RENDITION_LAYOUTS constant more general
Define def_rendition_layout_methods by more general way
Move fixed_layout.rb
[REFACTORING]Define methods with more general variable names
Define methods around rendition more generally