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Support 'be' channel so you can download dart-sdk from the tip. (#10625)

* Support 'be' channel so you can download dart-sdk from the tip.

This is triggered when you put 'hash/<build hash>' into dart-sdk.version file. For example, 'hash/c0617d20158955d99d6447036237fe2639ba088c'

* Add README.md

* Fix grammar, spacing, 80 chars, nicer ===
A
Alexander Aprelev committed
272faba1c0ae2a7513bd020865f083adf83025ed
Parent: e38f92d
Committed by GitHub <noreply@github.com> on 6/13/2017, 3:28:16 PM