refactored a bit, command expanded, reuse list, added update (#1)
just local update, should we leave update -g to command line?
seperation of concerns of command: running npm, formatting npm output,
showing an output screen of text
used @FichteFoll's [suggesstion](https://github.com/wbond/package_control_channel/pull/3508#issuecomment-51857251)
to use leading dot for imports