Aioimaplib

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- tests : extract Mail.create_binary for convenience

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- fix : trailing whitespace bug causing "BAD Could not parse command" using gmail/IDLE
- fix : stop adding a space for the prefix 'UID ' -> 'UID'

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- fix : issue 12 Not properly buffering newlines for incomplete lines
- fix : imapserver with status of an inexistant mailbox
- fix : remove offset problem with strip() modifying length of read data
- fix : remove 'unknown data received' logs if line is empty

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- remove hard coded logging config
- doc : added logging settings

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- added rfc5032 'within' function to server and tests for aiolib (it is only YOUNGER/OLDER arguments)

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- pushing continuation in the queue when idled