Blinkstick

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* API to get and set number of LEDs for BlinkStick Flex
* Mode description update
* Display LED count with --info parameter for command line tool
* Option --set-led-count to change the number of LEDs controlled by BlinkStick Flex board

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* Use cross platform USB control transfer method for all functions
* Fix for matrix shift functions
* Updated readme with new installation details for Windows

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* Always require PyUSB 1.0.0b1, because b2 is broken

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* Python 3 compatibility
* Minor bug fixes

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* Correctly calculate required led data to be retrieved from the device for get_color function
* Fix to apply commands to all devices and not just one from command line tool

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* Display help only once when run without parameters and multiple BlinkSticks plugged in
* Set color with last parameter of command line tool
* --brightness command line option as alias to --limit
* Color parameter no longer requires hash for hex values in command line script
* Do not show usage information for infoblock, info and mode commands
* Command line tool options grouped into logical sections
* Minor tweaks