Created Factory for new reward

Based it on Health reward.
Hopefully this was a good idea.
Added actual reward.

This is how I have interpreted the coding style of the project.
Did a small fix in ScoreRewardFactory

"e" was not defined (of course!) so I changed it to a new exception.
Updated bukkit dependencies to 1.5.2

Needed this for scoreboard support.
Merging pull request.

Changed pom.xml back to original
Fixed Health reward and Score reward

Score reward needed testing and fixing, after last merge.
Health reward needed testing and fixing, after commit
https://github.com/Mtihc/TreasureChest/commit/769fcb7046ad9a88546294c883dc4bb41ed83f3f

Score reward added! Fixes
https://github.com/Mtihc/TreasureChest/issues/48