region/cell feature draft#3460

Merged

sougou merged 7 commits intovitessio:masterfrom

tinyspeck:upstream-region

Dec 18, 2017

Commits on Dec 8, 2017

Commits on Dec 13, 2017

Commits on Dec 14, 2017

doc updates
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Commits on Dec 16, 2017

let `ts *topo.Server` be a param to `GetRegionByCell`
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Commits on Dec 17, 2017

refactored to put `ts` ahead of `cell` param, renamed `UpdateCellsToRegions` as `UpdateCellsToRegionsForTests`
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