features added, api changes

API:
element.set_style_att now accepts (in addition) **kwargs e.g.
set_style_att(position='absolute')

Refactoring:
- proliferate usage of inline() throughout remote_document, instead of
__buf
- added a comodity function in remote_document: __pop_last_code_block
- simple example now uses new AIP (described above)
- README.md reflects change in example