Wfapi

Features:

- changed for easy node access.
- raise `WFRuntimeError` if error raised from web.
- all error except `HTTPError` are subclass of `WFError`

Changed:

- `wfapi_future.py` are renamed to `wfapi.py`

Added:

- `wfapi_future.py`
- Break legacy code. (but nobody use it!)
- It provide good name for access attribute
- etc...

Features:

- New Operation:
- bulk_create

First commit in github.

Features:

- Workflowy
- Support login.
- It support operation with workflowy service.
- WeakWorkflowy
- Subclass of Workflowy.
- It support direct operation with node.
- WFError
- This is exception class that raised from this api.
- Support Transaction at commit only.
- New Operation:
- edit
- create
- complete
- uncomplete
- delete
- undelete
- move