Phase 1 - extract model api V2 (wip for Review) DO NOT MERGE#7

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Sing-Li wants to merge 2 commits intomasterfrom

refactor_model_layer_v2

Commits on May 1, 2016

Phase 1 - extract model api V2
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Commits on May 8, 2016

added Meteor.dataProvider; migrate server calls to Meteor.dataProvider instead of Meteor.users; add unit tests to ensure compatibility when provider is mongo for legacy code
Sing-Li
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