Spotty

- additional runtime parameters for the container can be added using the "runtimeParameters" parameter in the configuration file
- version flag for the "spotty" command

- fixed the lambdas runtime
- the "onDemandInstance" parameter to run on-demand instances

- "subnetId" parameter (for the case when default subnets don't exist)
- "localSshPort" parameter (for the case when the instance doesn't have public IP address and SSH access is provided through a tunnel to a local port)
- "aws sync" fix for files of the same size
- fixed the docker "image" parameter

- fix permissions for key files
- choosing an availability zone fix
- flag for the "run" command to do a sync before running a script
- added "g3s.xlarge" instance type to the list of valid GPU instances

Fix: made the "bin/spotty" file executable.

Fix requirements in the `setup.py` file.