[RT] Replace excalibur-io with commons-io

[Antonio Gallardo]

Hi:

Recently on excalibur dev I found that most (if not all) the code in 
excalibur-io was moved to commons-io:

http://www.mail-archive.com/dev%40excalibur.apache.org/msg01599.html

Cocoon 2.1.x has only 3 references to exclaibur-io. They can be easily 
switched to commons-io.
Some other goodies:

1-Some of the methods in o.a.c.utils can be switched to commons-io
2-Lenya distribute commons-io as an additional jar.

WDYT?

Best Regards,

Antonio Gallardo.