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Add a flutter tools section to CONTRIBUTING.md (#7640)

* Tweak the contributor guide with info on working with the flutter tool

* Slight phrasing

* Review edits on doc phrasing

* Review notes

* Small review tweak
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xster committed
606ee3610a6325a9205182a027d7b9de805b95db
Parent: 46792dc
Committed by GitHub <noreply@github.com> on 1/26/2017, 3:00:06 AM