MSN -> Skype

- This commit replaces MSN with Skype. All MSN usernames are converted
to Skype format.

*Side Note: there is actually a fair amount of Skype API for call /
chat / conference buttons, might be a fun mod eventually*

Signed-Off: Matthew "Labradoodle-360" Kerle <lab360@simplemachines.org>
Cleaning up after myself.

Thanks @emanuele45

Signed-Off: Matthew "Labradoodle-360" Kerle |
<lab360@simplemachines.org>
Fixed a Typo

- Mehr, thanks Oldies!
Merge pull request #349 from Labradoodle-360/skype-support

MSN -> Skype