Gwork Continuous Integration

I added a Null renderer to Gwork, i.e. one that doesn't draw anything. This makes it easier to do things like cross-platform build testing. We might check several different configs of the build without having to link to a graphical API.

This is useful because if anyone submits any patches to Gwork they will be tested in the pull-request queue. Users can also add tests builds their own Travis accounts so they can see if their fork is building.

Travis

For Linux and MacOS (OSX) builds I used Travis. It is a free service, so I can't complain too much, but it took a considerable amount of fiddling around to get Linux builds working. I won't bore you with the details.

Travis current live build status: