Windows/JRuby 1.5.0 spec fixes

[Pepijn Van Eeckhoudt <pe...@luciad.com>]

I've been able to get the number of failing specs down to 11. The ones 
that still fail fall into two categories:
- FileUtils.touch is not updating the mtime of directories correctly. 
I've reported this as JRUBY-4837 with an included spec.
- File permission checking does not work on Windows. This causes the 
'manifest 644' and 'ziptask should preserve permission' specs to fail

I'm not sure how the second category can be resolved. I had a look at 
Ant's zip and tar tasks to see how it's supported there. Those tasks 
extend FileSet by allowing explicit uid,gid and perm values to be 
specified. Similar options should probably be added to the 
ArchiveTask#include methods. That way the perms in the final archive and 
the perms on the fs could be decoupled. Any thoughts on this?

Pepijn