Added quick implementation of an attribute dict.
Added quick implementation of an attribute dict.

This looks to be superior to other implementations I've seen, since ipython
will autocomplete the attributes. Hopefully this can give some idea of how to
build, say, a Metadata class.

datreant/datreant,datreant/datreant,datreant/datreant.core,datreant/datreant.data,datreant/datreant.core,andreabedini/datreant,dotsdl/datreant