Heka-py

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- changed the _config attribute to be a flat json string for simpler
debugging in production systems

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- Added a _config attribute on the client instance so you can inspect
the actual configuration that is in play.

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- HekaClient now accepts single string values for the `disabled_timers`
argument.
- Fixed bug where timer wouldn't be disabled if the function name didn't match
the timer name.
- Added better error handling for invalid unicode. Unserializable
messages will now get routed to stderr
- A new heka benchmark command line utility (mb) is now included

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- Fixed a bug where `client_from_dict_config` would mutate the input
configuration causing subsequent use of the configuration to fail.

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- Couple of bug fixed in decorator base class.
- Added support for UdpSender to have multiple listener hosts.

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- Properly handle 'self' arguments when decorators are used on a method.
- Only apply string formatting to 'oldstyle' messages if string formatting args
are actually provided.