Fixed var names in documentation of query keywords
moved Messages and Imbox to their own modules, imported Imbox.imbox into __init__.py and put it in __all__. fixes#130.
clarified in documentation and Imbox.messages logging that, unless a folder is specified in the kwargs to Imbox.messages, the returned messages will be from the inbox. In the documentation this is accomplished exclusively by the var names. fixes#128.
amended `8df7d7c` to reflect manual changes made to `README.rst` in current master, but also added `inbox_` to several var names to make that explicit in the documentation. Added flags to messages returned by `fetch_email_by_uid`, using the new function `parse_flags` in `parser.py`. Fixes#126.
added TODO back into query.py
