Project 3: Kaixiang Miao#10

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immiao wants to merge 10 commits intoCIS565-Fall-2016:masterfrom

Commits on Oct 5, 2016

finished basic path tracing
immiao
committed

Commits on Oct 6, 2016

added sorted materials and cached first iteration rays
immiao
committed

Commits on Oct 7, 2016

wrong depth of field
immiao
committed

Commits on Oct 8, 2016

Commits on Oct 10, 2016