added a HAL for CAN interfaces#53

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dunmatt wants to merge 5 commits into

rust-embedded:masterfrom

Commits on Mar 2, 2018

stubbed in a basic HAL for CAN interfaces
M@ Dunlap
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Commits on Mar 3, 2018

cleaned up the CAN HAL proposal, moved a lot of functionality into can_utils
M@ Dunlap
committed
created distinct traits for CAN interfaces and CAN-FD interfaces
M@ Dunlap
committed
minor tweaks
M@ Dunlap
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removed not strictly necessary speed setters and moved the CAN-FD specific speed setter into the appropriate trait
M@ Dunlap
committed