Add 404 logging + Regexp matching for redirection rules possibility. 

Hello,

I added a few feature I was looking for.
- All 404 that can not be matched with a redirect rules are logged and presented to the user. That's highly valuable when revamping a website, to make sure no URLs are lost in the process (and easily track the missing one and take action).
- 404 logged can easily be transformed to a Rewrite rule
- Added Regexp matching and replacing. It uses basic php function, seems to work quite well.
- Added caching of previously encountered rewrite rules (to avoid hitting the database to often when a rewrite is common)

Since it adds a few new columns to the modRedirect table, so it might not works perfectly as an update to previous versions. I'm sure there is a way to handle that properly though. I was also unable to update the Schema for sqlsrv. Finally, as I don't speak so many languages, I only updated the English and French lexicons.

I took the liberty to add my name to the list of contributors :) and pop the version number since I believe this is quite a major change.
I also understand that, as it's quite a major change, it might not really respect the original idea behind Redirector. If it's uncool, I'll just fork it but I'd be much happier to integrate that directly in Redirector.