[do not merge] Accept new file share based internal nuget feed when regenerate library from hyak specs

Mark it "do not merge" for the reason that i would like this PR merged after the one made at hydra-spec-pr, so the common information like feed name  can be consistent. But this won't stop from reviewing other script change.
1. Modify the hydra grunt task to accept the new file based feed
2. Provide a script to automate library re-generating (for self-servicing purpose)
3, Fix jshint warnings I came across.