Implement filtering for multiple CAN ids#20

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M4GNV5 wants to merge 3 commits intosandeepmistry:masterfrom M4GNV5:master

+154-4

Commits on May 31, 2019

implement a multiFilter function for the MCP2515 which allows to filter for multiple can ids (standard only for now)
M4GNV5
committed
add multiFilter to the api doc
M4GNV5
committed

Commits on Jun 16, 2019

fix wrong register numbers for filter registers 3-5
M4GNV5
committed