Sorry for any GitHub notification spam tonight - I was testing out the build system....

It's all up and running so now every libMesh pull request will automatically get checked against a "make check" and the MOOSE test suite.

Just to get us started this is only running in optimized mode on linux.  We'll expand later.

I already see a few things I want to add to MooseBuild just from getting this set up tonight... most notably: recipes need separate distinct steps and the results need to get reported back after each step so that you can see what the heck it's doing.

Anyway - let's see how it goes and be free with the feedback.