Fixed safe teleport for now and added some java docs.
The whole process will still need to be updated on any minecraft update
if new unsafe or non-1-block-height blocks are introduced. We will need
to wait until bukkit provides us with a good API to do this.

This is currently not updated to 1.5!
Improved the LanguageManager and added java docs.
This also forces reading language files provided with the plugin using a
UTF-8 BOM. This should not be necessary but might 'fix' a strange error
when these files are not correctly recognized as UTF-8.
Added '%player%' variable to invited-messages.