Berkshelf path now includes machine name.  This is to enable parallel provisioning of multiple machines, without having to share a single berkshelf location (which doesn't work).
Newer version of rake doesn't work due to library dependencies.
Using explicit parentheses for readability.
Oops accidental commit, wasn't supposed to be pushed.
Specifying Berkshelf location, so that vagrant runs can be in parallel (otherwise, multiple machines will overwrite each other's berkshelf).
Parenthesised method call for readability.
Made mkshelf work if parameter is not supplied, for backward compatibility, and updated tests appropriately.
Merge pull request #38 from aodn/c9a5681e797608424bb131213caa0216af1ea3bc

Parallel provisioning