Lots of new things

Moved all configuration into settings.php
Added the changes to README
Added usage of $_SESSION['steam_uptodate'] to README and example.php
UserInfo.php now validates the data on every load
^ To fix empty variables due to SteamAPI outages while steam_uptodate
still beeing set
Fix

Spooky things can happen when coding after midnight...
Including stupid bugs like this.
Update
Even more missing README changes

I guess coding at 3 am isnt a good idea.
Merge pull request #22 from BlackCetha/master

Lots of new things - thanks BlackCetha!