Commits on Jun 16, 2016

1. [flow] annotate accumulate and accumulateInto …

   Summary:
   Trying to start adding flow types to files in React. I needed to add a script to package.json in order to run flow, flow-bin is already a dependency.
   
   I had to rewrite the implementation a bit. Flow doesn't recognize
   
   ```
   var currentIsArray = Array.isArray(current);
   if (currentIsArray) {
     // not refined
   }
   ```
   
   but the following does work
   
   ```
   if (Array.isArray(current)) {
     // refined
   }
   ```
   
   Test Plan:
   npm run-script flow
   npm run-script test accumulate
   
   Reviewers: @zpao @spicyj

   

   vjeux committed Jun 16, 2016
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