Several Changes.

Updated Cuis-Network-Url (almost all classes checked)
Added in Cuis-Network.Protocols HTTPSocketSqueak (the HTTPSocket class
from Squeak that I need to merge with ported from Pharo 1.4)
Added Cuis-Network-Mail (Taken from Pharo 1.4 and added in this package
the MailSender Class that is usually on SystemApplication