Add mutateIn and lookupIn to Couchbase Bucket definition.

[JesseObrien]

I'm adding these to at least make them available to be used by typescript. There's more work to be done to add the proper return types including a LookUpInBuilder and MutateInBuilder but I don't have time to put these into play right now. I'll consider adding those later.

If changing an existing definition:

• Provide a URL to documentation or source code which provides context for the suggested changes: https://github.com/couchbase/couchnode/blob/4e61a6390275a8aa1ff94cc05bdfed9a50af6b6d/lib/bucket.js#L2789
  https://github.com/couchbase/couchnode/blob/4e61a6390275a8aa1ff94cc05bdfed9a50af6b6d/lib/bucket.js#L3046
• Increase the version number in the header if appropriate.
• If you are making substantial changes, consider adding a tslint.json containing { "extends": "dtslint/dt.json" }.

[dt-bot]

types/couchbase/index.d.ts

to author (@maouida). Could you review this PR?
👍 or 👎?

Checklist

• pass the Travis CI test?

[rbuckton]

The build failed due to an npm issue. After restarting the build there are errors that must be corrected.

[rbuckton]

Use of the object keyword requires you to add a // TypeScript Version: 2.3 comment at the top of the file, per the readme

[typescript-bot]

@JesseObrien Please fix the failures indicated in the Travis CI log.

[RyanCavanaugh]

@JesseObrien Please fix the failures indicated in the Travis CI log.

[mhegazy]

Thanks for your contribution. This PR has failing CI tests and can not be merged in at the time being. For housekeeping purposes we are closing stale PRs. If you'd still like to merge this code in, please open a new PR that has been merged and rebased with the master branch.