Add script to create "Release" version of nfEngine with demo

[lookeypl]

To make releasing of new engine versions easier we need a script which will automatically copy built data into separate directory and zip it into archive.

• Create script which will build release version of nfEngine
• Copy data to separate directory, together with required additional files
• If needed, create a configuration for nfEngine with new paths (this needs external configuration, right now it is underway)
• Zip everything into archive ready to be released