added controls variable in starttls example

[undoingtech]

Regarding issue #326. Added controls variable and parameter to the starttls example.

[jsumners]

Can we add a note about why we are doing this?

[undoingtech]

I think I made a mistake with this PR. I was under the impression that the controls parameter was required. Technically the controls parameter is required as currently implimented, but it should be optional (as according to the "Common patterns" section in client API documentation).

I would rather fix the code than update the documentation.

I suggest this PR be closed/rejected. I will start a new PR where I fix the starttls function so the controls parameter is optional.

[jsumners]

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