completed homework!#14

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sheyoshida wants to merge 7 commits intoaccesscode-2-2:masterfrom

sheyoshida:master

Commits on Sep 15, 2015

Commits on Sep 16, 2015

revised
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Commits on Sep 17, 2015

Commits on Sep 18, 2015

using delegate and notifications in part two
sheyoshida
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