Restructure into `Lab` folders for easier navigation#2

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darylf wants to merge 3 commits intoaporter:masterfrom

darylf:master

Commits on Apr 23, 2015

Restructure into `Lab` folders for easier navigation
darylf
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Commits on May 28, 2015

Merge branch 'master' of https://github.com/aporter/coursera-android-labs
darylf
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Fix the accidental restructuring caused by merging `aporter`'s recent commits.
darylf
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