CAN configuration is passed to the constructor as an argument

[morcibacsi]

The CAN configuration is passed as an argument to the constructor. The examples are only changed at that line but github somehow fails to detect it (maybe because of the EOL character differences)

[nikeee]

I'm writing a wrapper that wraps this library into something that looks like the CAN bus API of the particle photon. Not having a global variable with a specific name would help there.

Is there any chance we can merge this? @miwagner