Visual Studio 2014 support for node v0.10.x series

Work in progress to get node v0.10.x working against Visual Studio 2014


I think it's mandatory, but I haven't investigated very much.

My experience was like this:
* first run without this change -> build stopped with error message. Something like `couldn't find WinSDK or ctrpp`
* inserted `x64` -> build was successful
* second run, where I accidentally had changed `bin\x64` (correct) to `x64\bin` (wrong) -> build was __successfull__

I think some info/data/? gets generated and cached, if `ctrpp.exe` is found. If it is not found afterwards the cached data is used.