[TypeScript] Add endpoint property to AWS.S3 instances

[RLovelett]

The documentation for AWS.S3 states that it exposes a property, endpoint, which is an AWS.Endpoint object.

However, the declaration for AWS.S3 does not expose the property.

This patch resolves that issue.

I tried to copy all the things I did for #1339.

[coveralls]

Coverage remained the same at 91.863% when pulling bf8885e on RLovelett:bugfix/s3-without-endpoint into 0642da0 on aws:master.

[coveralls]

Coverage remained the same at 91.863% when pulling bf8885e on RLovelett:bugfix/s3-without-endpoint into 0642da0 on aws:master.

[coveralls]

Coverage remained the same at 91.863% when pulling bf8885e on RLovelett:bugfix/s3-without-endpoint into 0642da0 on aws:master.

[chrisradek]

@RLovelett
Thanks again for your PR!
The typings in the clients folder are all auto-generated with each release, so can't be modified directly.

In this case, all services should expose the endpoint parameter. Since each service client extends Service, you could add endpoint: Endpoint there:
https://github.com/aws/aws-sdk-js/blob/master/lib/service.d.ts

From a testing perspective, I think you can do you could do something like below in ts/s3.ts:

import {Endpoint} from '../lib/endpoint';
/* existing code */
var endpoint: Endpoint = s3.endpoint;

[RLovelett]

@chrisradek thank you for the review! I have made the changes you've requested.

[coveralls]

Coverage remained the same at 91.83% when pulling 5d9be30 on RLovelett:bugfix/s3-without-endpoint into d0fb1a0 on aws:master.

[coveralls]

Coverage remained the same at 91.83% when pulling 5d9be30 on RLovelett:bugfix/s3-without-endpoint into d0fb1a0 on aws:master.

[chrisradek]

@RLovelett
Thanks! PR looks good to me, merging.

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