binary-search-tree uses node.js util module

[deive]

Hi, your dependency binary-search-tree uses the node.js util module, so this is not working in react-native. See louischatriot/node-binary-search-tree#14
To get around this you can:

1. npm install util --save
2. Use my pull that just copies the single required method to binary-search-tree, so it doesn't require util - Removes dependency on node.js util module louischatriot/node-binary-search-tree#17

[flexyford]

Thanks for your help. fixed in #44