Mmstats

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* [API CHANGE] - MovingAverageField's kwarg changed from window_size => size
* Refactored __init__.py into fields, models, and default (and imported public
bits into __init__)
* Added TimerField (MovingAverageField + context manager)
* Added docs (don't get too excited, just a start)

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* [API CHANGE] - RunningAverage field is now AverageField
* Added MovingAverageField with window_size=100 parameter
* Tests can now be run via "python setup.py test"

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* Fixed pollstats
* Updated README slightly

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* Added clean module and cleanstats script to clean stale mmstat files
* Added path kwarg to MmStats class to allow easy path overriding
* Added StringField for UTF-8 encoded strings
* Added StaticFloatField & StaticDoubleField
* Added created UNIX timestamp (sys.created) to default MmStats class
* Moved all modules into mmstats package
* Fixed mmash template packaging
* Fixed test mmstat file cleanup
* Refactored reading code into mmstats.reader module

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* Use ctypes.get_errno() instead of Linux specific wrapper

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* Fix libc loading on OSX