Build command on windows machine generates wrong path in chcp.manifest

[nikDemyankov]

If you run cordova-hcp build on windows machine - chcp.manifest contains full path to the files instead of the relative ones.

For example, on windows you will get

[
  {
    "file": "C:\\projekte\\ai\\project\\www\\css\\style.css",
    "hash": "0699289c56ae49c509e03e49fdbd0b1b"
  }
]

but it should be:

[
  {
    "file": "css/style.css",
    "hash": "0699289c56ae49c509e03e49fdbd0b1b"
  }
]

Also, \\ must be replaced with / since file is attached to the content_url as it is.