Compilation issues on Windows with maven

When trying to build the cli project from this repo or from the [main pipeline](github.com/daisy/pipeline) repo on windows, i noticed several issues :
- the maven project relies heavily on make and could be replaced by maven calls
- the yaml dependencie failed to download from launchpad and should be replaced by its [newer repo](https://github.com/go-yaml/yaml)
- With the latest version of the repo, an int to string conversion error is raised from utils.go (an explicit conversion of a minJavaVersion to string is required)

I also noticed tests issues, where unix path (like '/tmp/') are used.