Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/bintrees/examples/node.js

@@ -0,0 +1,13 @@
+var Tree = require('..').RBTree;
+
+// create a new tree, pass in the compare function
+var tree = new Tree(function(a, b) { return a - b; });
+
+// do some inserts
+tree.insert(1);
+tree.insert(2);
+tree.insert(3);
+tree.remove(2);
+
+// get smallest item
+tree.min();