vm.Script.runInContext has error in argument dispatch, needs documenting

[amb26]

Method "vm.runInContext" or "vm.Script.runInContext" is only shadily implemented - it has an entry in vm.js and node_script.cc but it is not part of the official documentation and its arguments are dispatched inconsistently.

http://nodejs.org/docs/v0.4.8/api/all.html#executing_JavaScript

Presumably the actual intent was for the signature to be

vm.Script.runInContext(code, userContext, [filename])

this is the signature expected within jsdom -

https://github.com/tmpvar/jsdom/blob/master/lib/jsdom/level2/languages/javascript.js

However the argument list is handled incorrectly within node_script.cc, using index 1 for the filename in this case. This leads to stack traces being corrupt for such loaded code, using .toString on the context object rather than the actual filename. This also prevents the ChromeDevTools to be used to debug such an application since the string [object Context] tries to be interpreted as a filename.

[amb26]

See #1141