node-webkit 0.10.0 version fix also on run

On windows, nwbuild -r source_folder will ignore cached node-webkit
Merge pull request #39 from nolith/patch-1

node-webkit 0.10.0 version fix also on run
Merge branch 'master' into develop

* master:
  node-webkit 0.10.0 version fix also on run
Fix and add a bit of error handling
Merge pull request #36 from 1j01/node-webkit-builder