Copyable Content
Some content does not need to be transformed by a plugin, but can simply be copied. The copy plugin can be used for this purpose. The following attributes are available:
| patterns | List of file patterns of files to copy. | 
| excludes | List of file patterns to exclude. | 
| matching | matching method, default is "glob", specify "re" to use regular expression matching. | 
Example: copy all css files to the target directory:
cssfiles = plugin("copy")
cssfiles.patterns = [ "*.css" ]
cssfiles.excludes = [ ".svn/*" ]

