Added experimental addition of OSX build, which is setup to not fail is OSX...

Added experimental addition of OSX build, which is setup to not fail is OSX build fails, until it can be stabilized. Added os-specific init, namely for cppcheck, which will hopefully still work on linux nodes. Disabled new Travis config validation, since fails with os=osx added. May need to get travis to turn on the support for OSX to get it working.
Cleaned up/simplified test server operation.