Major refactoring
Groundwork to support different APIs (synnefo andplankton).
New configuration mechanism (kamaki config)
Support extended personality attributes
All attributes except path are now optional andwill be filled based on the file of path.
Refs #1645
Allow more than one metadata updates at the time
Refs #1399
Improve logging output
Use _post instead of _cmd
Add docstrings to a number of client methods
Improve logging
Do not use the root logger.
Refs #1337
Fix bug introduced by previous commit
Include HTTP status in ClientError exceptions
Add init.py to make kamaki a python package
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