added artifact repository initial functionality
added logging for wrong files
added verbose logging for artifact directory scan
added documentation entry about artifact usage
added support for nested location of composer.json files within artifacts
added fixture dummy artifacts
set version to dev-master to artifacts without version
travis locale version order fixed
modified test in order not to depend on sorting order
changed documentation typo
Removed dev-master as default version for versionless artifact
Added notice about need of zip extension
fixed typo in doc
Merge remote-tracking branch 'nfx/artefact-repo-type'
CS and wording fixes, refs #1728