[proposal] Add 'ContentDisposition' to parameters sent to s3 client

[ashishmadeti]

I was not able to pass on the Content-Disposition header in any way to the s3 client (I tried with adding headers['content-disposition'] but it did not work)

After applying this patch, ContentDisposition can be added the object passed in as the first parameter to upload() function of skipper. This is working as expected

[sailsbot]

Hi @ashishmadeti! It looks like the title of your pull request doesn’t quite match our guidelines yet. Would you please edit your pull request's title so that it begins with [proposal], [patch], [fixes #<issue number>], [implements #<other PR number>], or [misc]? Once you've edited it, I'll take another look!

[sailsbot]

Thanks for submitting this pull request, @ashishmadeti! We'll look at it ASAP.

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[ashishmadeti]

Looks like the build failure is due to missing credentials. It is working fine on my system.

Let me know if I can help in any way.