FIX: return, when function cannot be found

call sys.exit(1) when runsolver_wrapper cannot find function
ENHANCEMENT: #18, #4 setup.py loads benchmarks and optimizers

when using python setup.py install
 * branin and hartmann6 benchmarks are copied to cwd
 * optimizer folder is copied to cwd
 * optimizer sources are downloaded from automl.org
Merge branch 'development' of https://github.com/automl/HPOlib into development