Pylibftdi

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* lots more documentation, cleaned up, on readthedocs. Still in progress though.
* Experimental support for multi-device interfaces ``Device(interface=1)``

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* include examples subpackage
* ensure examples work under Python3
* 'python -m pylibftdi.examples.led_flash' should now work and pulse D0

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* maintenance build to fix installation issues
* USB_VID_LIST/USB_PID_LIST exposed directly as pylibftdi attributes

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* support for FT232H via iteration over lists USB_VID_LIST/USB_PID_LIST in
driver.py (FT232H uses different PID)
* support for 'buffering' - i.e. chunking reads and writes to allow
interruption (i.e. KeyboardInterrupt) in what could otherwise be a very long
uninterruptable extension code call.
* reset device to serial mode on open() (previously could be left in bitbang mode)
* moved docs -> /doc
* moved pylibftdi/tests -> /tests - makes python -m unittest discover etc work better
* removed legacy support for Driver() to acting as a Device()
* API for Bus class now requires .device rather than .driver (this still needs
improving at some point)

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* improved and extended tests
* made a start on some Sphinx-based documentation
* fixed long-standing issue with input from a BitBangDevice
* allow the PID/VID to be changed
* add new examples
* basic web server to toggle / read IO bits
* magic_candle.py - example of using input and output together
* pin_read.py - read and match values on device pins
* All of this needs some tidying, but it fixes some key issues and has been unreleased too long.

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* fix issue with bitbang following API changes in 0.8
* add tests for bitbang mode
* refactor tests; fix text-based tests in Python3
* slight refactor Device() to improve testability (_read and _write methods)