Ar-code attachment_fu

While running my project on windows I noticed an anomaly in the FileSystemBackend#current_data method. The issue is identified in the following post:

http://rubyforge.org/pipermail/r...

The use of File.read returns inconsistent results on windows. The solution is to pass a block to File.open. The following code will resolve the issue.

#line 94 file_system_backend.rb
def current_data
  File.file?(full_filename) ? File.open(full_filename, "rb"){|f| f.read } : nil
end