Request to merge Specs-2017-09 with master#158

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JingyiSu wants to merge 18 commits intomasterfrom

Commits on Sep 13, 2017

Commits on Sep 14, 2017

Added missing fields in 2 files
JingyiSu
committed

Commits on Sep 17, 2017

Ast.java file related updates
JingyiSu
committed

Commits on Sep 18, 2017

Changes for Spec
JingyiSu
committed

Commits on Sep 19, 2017

Commits on Sep 26, 2017

Commits on Sep 27, 2017

add test case
psybers
committed

Commits on Oct 4, 2017