Use IO deprecated correction

Updated 5 pm files to correct deprecated error. “Use IO;” was updated
to “use IO::Pipe;”
Fix reported in issue #31

Reported by Brad0:

“noticed there are still some temp files being left around of the
filename template MailScanner.LastSpam.XXXXXX which looking around seem
to be coming from
mailscanner/bin/MailScanner/CustomFunctions/LastSpam.pm.”
Fixed -U option in /usr/bin/perl

Newer versions of perl throw errors when the -U option is not included
in the declaration.
Change log in the repo out of date

Updated the contents of the change log to match mailscanner.info and
the current version.
Update wiki URL
Update README
Update README
Update README
Updated Readme

Creating the MailScanner wiki on github. Updared links
Merge branch 'master' of https://github.com/MailScanner/MailScanner

Conflicts:
	README
Readme Update again
Updated wiki link

Added github wiki link