node/closure glue. yes, it really is this easy

Hello @dpup, 

Please review the following commits I made in branch 'nick-nodejs'.

d20f8db104eee7ced94d650f87cf65d76c4d1486 (2013-07-09 23:17:15 -0400)
Leave the python files in closure-library, so we can generate deps files

209d402e45a3313a740f6fbc5c4390de4cf99b70 (2013-07-09 23:16:05 -0400)
Add a nodejs tool for bootstrapping closure-library


R=@dpup