[WIP] Fixes for "deploy from Windows"

The changes necessary to get brooklyn-sample running on Windows. Must be started with "-Djava.io.tmpdir=C:/temp"


+1.  as we do more with windows we might want to refactor this anyway, but for now you're right, i tend to think these corner cases are very rare and the effects minor (and easy to discover).  pales in comparisons to places where paths are not properly quoted so if you put a space in it, things will break!  i'd love to fix these when we get a chance but at least these can all easily be worked around until then.

an easy thing which might prevent some confusion is to call the method `isAbsolutish` and note in javadoc the points you make.