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Change login flow (experimental) (#223)

This is the flow (more or less):

`clasp login`: logs you in using the default `clasp` credentials. Saves `.clasprc.json` to your `~` directory.
`clasp login --creds`: logs you in using the file `credentials.json` in the directory that you are running the command in. Saves `.clasprc.json` to your current directory.
`clasp login --creds other_creds.json`: logs you in using the credentials in `other_creds.json`. Saves `.clasprc.json` to your current directory.

Your credentials file should look like this:

```
{"installed":{"client_id":"239267426989-275aglft6htcfsdj7t5d3csdlogchamh.apps.googleusercontent.com","project_id":"project-id-xxxxxxxxx","auth_uri":"https://accounts.google.com/o/oauth2/auth","token_uri":"https://accounts.google.com/o/oauth2/token","auth_provider_x509_cert_url":"https://www.googleapis.com/oauth2/v1/certs","client_secret":"xxxxxxxx","redirect_uris":["urn:ietf:wg:oauth:2.0:oob","http://localhost"]}}
```

Signed-off-by: campionfellin <campionfellin@gmail.com>

Related to #204 

- [x] `npm run test` succeeds.
- [x] `npm run lint` succeeds.
- [ ] Appropriate changes to README are included in PR.

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