Update rstudio proj opts
Ignore local auth cache
Use new httr features
Add an additional scope for BQ credentials.

This is one of the "standard" scopes in the BQ API description; it's not
strictly required for anything right now, but no reason not to include it.

Also fixed a typo.
Switch to using `totalRows` to determine `tabledata.list` completion.

It looks like BQ is (possibly erroneously?) returning us a `pageToken` when we
do a `tabledata.list` on an empty table. This switches us to just use the
total number of rows fetched; it's slightly less pretty, but much prettier
than infinite loops on empty tables. `;)`

Fixes #15.
Merge pull request #16 from craigcitro/scopes

Add an additional scope for BQ credentials.
Merge pull request #13 from hadley/modern-httr

Modern httr
Merge pull request #15 from craigcitro/neverending

non-stop runing