Add the threaded and async libusb senders.
Apply Peter's changes.
Fix a leak in the LibUsbThreadTest.
Merge pull request #541 from nomis52/libusb-int

Add the threaded and async libusb senders.
Add the Anyma, Eurolite and Fadecandy widgets.
Add the missing files.
Address Peter's comments.
Merge pull request #543 from nomis52/libusb-int

Add the Anyma, Eurolite and Fadecandy widgets.
Merge branch 'master' of github.com:OpenLightingProject/ola into libusb

Conflicts:
	plugins/usbdmx/AsyncUsbSender.cpp
	plugins/usbdmx/AsyncUsbSender.h
	plugins/usbdmx/SyncronizedWidgetObserver.cpp
	plugins/usbdmx/SyncronizedWidgetObserver.h
	plugins/usbdmx/ThreadedUsbSender.h