cosmetics
move old unittests to a retire directory
integrate google test externals into build system
add skeleton for new unit tests based on googletest
Merge pull request #138 from reneme/unit_testing

Integration of googletest as Unit Testing Framework

This integrates googletest 1.6.0 into the build environment and provides an (extremely basic) skeleton to get started with unit tests powered by it.
cosmetics
improve logging for whiteliste verification errors
Merge branch 'master' into history