Allow clasp open to work for any scriptId

[campionfellin]

Adds optional parameter [scriptId] to clasp open command.

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

Fixes #100

• npm run test succeeds.
• npm run lint succeeds.
• Appropriate changes to README are included in PR.

[coveralls]

Pull Request Test Coverage Report for Build 116

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• 102 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 11.187%

---

Files with Coverage Reduction	New Missed Lines	%
index.js	102	6.92%

Totals
Change from base Build 112:	-0.05%
Covered Lines:	108
Relevant Lines:	722

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💛 - Coveralls

[grant]

First describe what it does without options (90% of cases). Then describe options.

Opens the `clasp` project on script.google.com. Provide a `scriptId` to open a different script.

[grant]

Let's write this:

getProjectSettings().then(openScript);

const openScript = (scriptId?) => {
  if (!scriptId) return;
  // if (scriptId.length < 30) { ... length check
  // } else { ... log and open
}

In the future (when getProjectSettings is async):

const openScript = (scriptId?) => { ... }
openScript(scriptId ? scriptId : (await getProjectSettings()).scriptId);

[grant]

#146 Created issue for async getProjectSettings

[grant]

Marking as requesting changes.

[grant]

LGTM!