Adds Voicer support to AddressBook.#1

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gorkemmulayim wants to merge 5 commits intomasterfrom

Commits on May 1, 2018

Added voicer support for deleting contacts.
gorkemmulayim
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Commits on May 2, 2018

Commits on May 10, 2018

Removed redundant threads.
gorkemmulayim
committed