Moved underscore from deps to devDeps as it was unused

Fixes louischatriot#7

Author: JamesMGreene

lib/avltree.js

@@ -4,7 +4,6 @@
 var BinarySearchTree = require('./bst')
   , customUtils = require('./customUtils')
   , util = require('util')
-  , _ = require('underscore')
   ;
 
 

package.json

@@ -17,16 +17,15 @@
     "type": "git",
     "url": "[email protected]:louischatriot/node-binary-search-tree.git"
   },
-  "dependencies": {
-    "underscore": "~1.4.4"
-  },
+  "dependencies": {},
   "devDependencies": {
     "chai": "1.0.x",
-    "mocha": "1.4.x"
+    "mocha": "1.4.x",
+    "underscore": "~1.4.4"
   },
   "scripts": {
     "test": "make test"
   },
   "main": "index",
-  "licence": "MIT"
+  "license": "MIT"
 }