UI tweaks and bug fixes

• fix ga_account_list() not dowloading starred columns (#284 - thanks @hidekoji)
• Allow millisecond parsing of times (#314 - thanks @VadimChernik)
• Update to use cli for nicer looking user messaging
• Change the default client.id (#311)
• Allow authentication via a service account key directly in ga_auth(json = "file.json")
• Remove GARGLE_EMAIL auto-auth on package load as could stop package loading under some circumstances.
• Add ga_auth_setup() to help walk through some of the advanced authentication setups
• Fix fetching all rows for google_analytics() when slow_fetch=TRUE and max=-1 (#321 - thanks @wdwatkins)
• Move to Cloud Build authenticated tests via googleCloudRunner