Added DataModel::Fields.dict
Serialization methods now have an additional depth parameter

Currently serves no real purpose except keeping track of how deep the loading/dumping is.
duck: Added README.md
test: micro-assert: Added assert_same and assert_not_same
core/link_node > link_node

LinkNode has been moved to a seperate module
data_model: Fields are Enumerable
data_model: Use send instead of [] to retrieve field values
dataman: fix typo in DataSerializer
twod: Updated bitmap_font to support latest RenderContainer methods
core: Text now supports opacity
render_primitives: Fixed RenderArray#clear ArgumentError
render_primitives: Added RenderArray#size
Added micro_json, a minimal JSON implementation written in ruby

It works to say the least, even if it looks creepy...
micro_json: Added core_ext
data_model: import can load other models without a &class using their respective #import methods
data_model: Updated doc comments
Added tmx
Migrate core rendering classes to render_primitives