Added check for libwww-perl package before trying to use it
Installs pop3 and imapd by default for #19
SSL on by default for #16
libemail-sender is not required, libmail-sender is (without the 'e')
Made it more obvious what happened when packages aren't found
Fixed syntax error in quote marks
Fixed Mail::Sender installer for #11
Removed debugging exit() from dealing with #11
Fixed runTest() for #10