I have better news!. Today I got the CAN class from the Atmel engineer. It is a raw class to start with. He really did a great job. Now, instead of ~40 files, we have 4 files. The CAN class (.c,.h) and the transceivers class (.c,.h). It compiles OK (0 errors/0 warnings) with the new IDE 1.5.2. I will be running some tests during this weekend and consulting with Arduino for the releasing in github next week. Thanks you for your patience.