Usb task delta time#8

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dewhisna wants to merge 2 commits intoarduino-libraries:masterfrom

dewhisna:usb_task_delta_time

Commits on Feb 13, 2016

Add ASCII control codes
bbx10
committed

Commits on Feb 14, 2016

Reworked USBHost::Task() to use a delta-time rather than compare with the absolute time from millis().
dewhisna
committed