Revert "Merge branch 'patch-1' into 'master'"

This reverts merge request !14 (merged)

This had a problem possibly due to the lack of quotes:

$ /build/build.sh
Building Dockerfile-based application...
sh: -n: unknown operand
invalid argument "/master:8c49bd381e1ab86a8486e02d105466476de31e53" for "-t, --tag" flag: invalid reference format
See 'docker build --help'.