Detect the right design set for vcard3

[kewisch]

Fixes #363

I don't see a better way to adjust the design set than to modify the getter. ICAL.parse() detects the design set but only returns jCal, so it needs to be somewhere in the component code.

[coveralls]

Pull Request Test Coverage Report for Build 8921649271

Details

• 17 of 17 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.004%) to 97.981%

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Totals
Change from base Build 8909071766:	0.004%
Covered Lines:	9359
Relevant Lines:	9535

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💛 - Coveralls