begin testing filters
Merge remote-tracking branch 'origin/master' into filters
Shortened delays between signal reception
Fixed Filters

Filters now work, but interface needs to be improved.
added mask macros to packet ids
Merge branch 'filters' of https://github.com/nusolar/sc7-arduino-code into filters
Testing with CAN speed.
CAN works at 1Mbps

Need to include 120Ohm termination resistors or we get reflections,
which causes bus errors.