rename some variables to better reflect what they are
dont even try downloading if the file already exists in the cache
finish log message for extract_artifact
ensure name attribute does not have whitespace
move call to delete_previous_versions and rework its logic
verify the delete worked
remove argument to delete_previous_versions
Merge pull request #46 from RiotGames/reconcile_artifact_retrieval

Finish 1.1.0 functionality