Throws error when using the click method on the document

@imaustink commented on [Mon May 08 2017](https://github.com/bitovi/funcunit/issues/206)

If you use `.click` like this `f.click(document)`, it throws the following error.
```
syn.js:173 Uncaught TypeError: Cannot read property 'jQuery' of undefined
at Function.jquery (https://unpkg.com/syn@0.5.0/dist/global/syn.js:173:49)
at Object.addOffset (https://unpkg.com/syn@0.5.0/dist/global/syn.js:326:30)
at init._click (https://unpkg.com/syn@0.5.0/dist/global/syn.js:515:25)
at new init (https://unpkg.com/syn@0.5.0/dist/global/syn.js:155:27)
at syn (https://unpkg.com/syn@0.5.0/dist/global/syn.js:131:20)
at Function.syn.(anonymous function) [as click] (https://unpkg.com/syn@0.5.0/dist/global/syn.js:578:24)
at HTMLDocument. (https://fiddle.jshell.net/0xxjv2o0/1/show/:49:5)
at fire (https://code.jquery.com/jquery-2.1.3.js:3094:30)
at Object.fireWith [as resolveWith] (https://code.jquery.com/jquery-2.1.3.js:3206:7)
at Function.ready (https://code.jquery.com/jquery-2.1.3.js:3412:13)
```
[JSfiddle](https://jsfiddle.net/0xxjv2o0/1/)

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@chasenlehara commented on [Tue May 09 2017](https://github.com/bitovi/funcunit/issues/206#issuecomment-300225197)

That looks like an issue in Syn, is it not?

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@justinbmeyer commented on [Tue May 09 2017](https://github.com/bitovi/funcunit/issues/206#issuecomment-300229114)

Try on the document.documentElement or document.body then.

Reproduce the failure from the linked JSFiddle with f.click(document), then inspect the syn.js stack locations for jquery, addOffset, and _click. Compare the document case with document.documentElement and document.body as suggested in the discussion. Done means clicking document no longer throws the reported TypeError, with the existing behavior for element targets preserved.

Written by the indexing model from the issue text.