Adds NSWorkspace.RevealFilesInFinder
Merge branch 'root/master'

Conflicts:
	macoslib/Cocoa/NSWorkspace.rbbas
NSWorkspace.RevealFileURLs checks of function availability before invoking it to avoid crash on pre-10.6 systems.
Adds NSWorkspace.RevealFiles(f() as FolderItem) because we also have a SelectFile that takes a FolderItem.
Merge pull request #89 from tempelmann/master

- NSWorkspace.RevealFileURLs checks of function availability before invoking it to avoid crash on pre-10.6 systems.
- Adds NSWorkspace.RevealFiles(f() as FolderItem) because we also have a SelectFile that takes a FolderItem.