Create QuickBooks.gs

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Update of Quickbooks OAuth1 example to support OAuth2.

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CLA signed.

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CLAs look good, thanks!

[ad-walker]

Updated style per linter.

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Additional changes per style guide.

[ad-walker]

Trailing whitespace removal.

[erickoledadevrel]

Thanks for adding this sample! Just a few small comments / changes.

[ad-walker]

Updates based on erickoledadevrel suggestions.

[ad-walker]

Corrected line length and trailing spaces.

[ad-walker]

Line length.

[ad-walker]

Remove trailing whitespace.

[ad-walker]

Removed last call to PropertiesService.getUserProperties().

[erickoledadevrel]

Looks great!