Fix confusing errors related to missing git
Fix error about a missing git file
When using the buildpack, a confusing No such file or directory: 'git' error message is shown because the rootfs for Docker Mendix Buildpack doesn't include git. This is not an issue, but the error message may be confusing, as it may be interpreted that the build failed.
In this release, we added a mock git binary to determine exact version of CF Buildpack and remove the confusing errors.
Closes #85