Fixes#11Fixes#12
* All relevant changes
* Code review comments
* Small changes
* Code review fix
* Run the server as default action
* Remove unneeded commands from dockerfile
* Update graphhopper.sh
Adjust usage text
Use `exit 2` for usage errors
* Update README.md
Update the default JAVA_OPTS value according to the Dockerfile
* Add execute permissions
* Fix extra "
* Fix missing space
* Remove unwanted spaces
* Update README.md
Co-authored-by: zstadler <zeev.stadler@gmail.com>