Fix typo
Use arbitrary verbs

Closes #169
Merge branch 'master' of github.com:hadley/httr
Fix typos in api-packages.Rmd vignette

accept instead accepts.
Merge pull request #170 from unikum/patch-1

Fix typos in api-packages.Rmd vignette
Default to the "oob" flow if httpuv isn't installed.

This modifies the logic in oauth token fetching to default to using the `oob`
flow (i.e. provide a URL and ask the user to copy-paste a code) whenever
`httpuv` isn't available to use locally.