Provide versioning information for libraries

[richmattes]

Would you guys be amenable to providing library versioning and ABI versioning (SONAME) to urdfdom? It's pretty simple to do in CMake, and it helps for things like parallel installation of multiple library versions, enforcing ABI changes through ld, etc. There's an example of how to do so in the urdfdom Fedora review request at https://bugzilla.redhat.com/show_bug.cgi?id=871205#c3, I can also code it up and submit a pull request if it's easier.

[isucan]

i believe this has already been done. can you take a look at the cmake code to see if it suits you?

[richmattes]

Whoops, I was looking at the 0.2.8 release tag, and didn't check master. It looks like this is already taken care of, and it looks good so I'll backport the patch for the Fedora package. Sorry for the noise!