Fix solution not starting on non-cygwin environments

This was caused by the config.json file containing comment
characters. It seems comments are not allowed in JSON (see
https://stackoverflow.com/questions/244777/can-i-comment-a-json-file )

Now the default config file is blank, and a config-cygwin.json file may
be used in a Cygwin environment.
Merge pull request #61 from sp3ctum/hotfix-default-conf-broken-in-non-cygwin-environments

Fix solution not starting on non-cygwin environments