Tests for broken raytracing

[LeroyR]

Some random rays that have broken box intersections

[davetcoleman]

Travis fails on this test?

[v4hn]

@LeroyR Are you sure these tests should succeed? I didn't verify the math.
If you are, any idea why the raytracing could fail?
It's a simple enough operation, i.e. it should work about always, or never.
And nobody else complained about this before. I concede though, that this doesn't mean that it actually works...

[LeroyR]

Yes, im pretty sure these test should succeed. I use this to generate maps for camera positions that are able to view a shelf of some bookcase and found good poses 'behind' the bookcase.
e.g. BrokenRay2 box x=0.2 at pose x=0.45 with ray from x=0 and direction x=0 should not intersect.

I dont know why the current algorithm fails. I replaced the code with google and it worked so i did not bother.

[davetcoleman]

Does #73 replace this?

[LeroyR]

merged into #73