Testing GzipHelper.copyFile
Renaming class to FileHelper
ZincRepo: throwing custom exception is bundle was not being tracked
FileHelper: don't copy file if it already exists
First attempt at limiting concurrency of bundle clones
Cleaning up
Fixed FileHelper
Small optimization in ZincRepo: don't rewrite index if nothing changed
Merge pull request #4 from mindsnacks/feature/concurrency

Limiting concurrency of bundle clones