add 'path' to stdlib. bad? not in commonjs but in node.js

src/stdlib/path.coffee

@@ -0,0 +1,15 @@
+# node.js path module
+# http://nodejs.org/docs/v0.6.0/api/path.html
+
+_ = require 'underscore'
+
+module.exports =
+  # Return the last portion of a path. Similar to the Unix basename command.
+  basename: (filepath) ->
+    _.last filepath.split '/'
+
+  # Return the extension of the path, from the last '.' to end of string in
+  # the last portion of the path. If there is no '.' in the last portion of
+  # the path or the first character of it is '.', then it returns an empty string.
+  extname: (filepath) ->
+    _.last filepath.split '.'