Add feature to add contacts and contact names to the address book

[laugengebaeck]

This closes #385 and #386.

[coveralls]

Pull Request Test Coverage Report for Build 890088424

• 38 of 38 (100.0%) changed or added relevant lines in 11 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+3.2%) to 75.643%

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Totals
Change from base Build 199368452:	3.2%
Covered Lines:	1000
Relevant Lines:	1322

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💛 - Coveralls

[sm1lla]

We should all memorize the style guides. I think we forgot to pay attention to some aspects in the last reviews.

[laugengebaeck]

Since nearly all requested changes have been resolved, I would merge this tomorrow :)