* add version replacement script and load via github-deploy.sh script
* update contributing doc accounting for version replacement script
* ensure new version changes are committed.
* set default variables and don’t change out $VID:$ when doing a pre-release
* show pre-release detection before bumping versions
* set the correct path for the version-changes script
* conditionally use correct sed for environment.
* switch to perl expression
Darren Ethier