Feature request: Local to Euler angles conversion

[chunky]

I previously was using the java variant of opendis, and it came with a helper function for converting heading/roll/pitch to euler angles for transmission.

I'm using the python version now, and I wish that it had a helper function.

[leif81]

This makes sense to me @chunky.

Would you be interested in working on this and providing a pull request?

[marcdtheking]

pull request #43 adds this enhancement