Updated async library dependency to 0.2.25
Updated Bucket.get/save/delete to return null when requests return no results, an Array of results when an Array of keys/RObjects were passed in, and only a single RObject when a single key/RObject was passed in.
Fixed reference to wrong variable in save and delete.
Version bumped to 0.2.0, GET, SAVE, DELETE API results slightly changed.  Now if you pass in an `Array` as input you'll get an `Array` of results as output, unless no results are returned in which case `null` will be sent back.  For single scalar input a single `RObject` will be returned.
Merge branch 'master' of github.com:nathanaschbacher/nodiak