Fixes issue #57 (generated version numbers have wrong format); with the change in this commit the build-bundle-file.sh script constructs a shell that parses the git version numbers a bit differently so that auto-generated version numbers for the Microkernel ISO are more consistent with the version numbers that were used in numbering our Razor Microkernel ISOs previously (versions like "0.9.3.0" instead of "v0.9.3.0").