fix npm version like we did on node sdk, so that travis works with node 0.8
Updated VM commands to use storage-legacy directly, not through
azure module.

From what I can find this is the only part of the code that actually
uses the azure module for storage.
Merge pull request #1384 from yugangw-msft/travis

fix npm version like we did on node sdk, so that travis works with node ...
Merge pull request #1389 from christav/use-storage-legacy

Updated VM commands to use storage-legacy directly, not through azure module.