travis_sync: Travis CI utilities
In romainfrancois/travis: Set Up 'Travis' for Testing and Deployment

Helper functions for Travis CI.

travis_sync() initiates synchronization with GitHub and waits for completion by default.

travis_browse() opens a browser pointing to the current repo on Travis CI.

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travis_sync(block = TRUE, token = travis_token(), quiet = FALSE)

travis_browse(repo = github_repo())

`block`	`[flag]` Set to `FALSE` to return immediately instead of waiting.
`token`	`[Token2.0]` A Travis CI token obtained from `travis_token()` or `auth_travis()`.
`quiet`	`[flag]` Set to `FALSE` to suppress success message.
`repo`	`[string\|numeric]` The GitHub repo slug, by default obtained through `github_repo()`. Alternatively, the Travis CI repo ID, e.g. obtained through `travis_repo_id()`.