Fixed id of bukkit repository

Fixed: The id of the bukkit repository is now actually "bukkit-repository".
Cleaned pom.xml

Removed unneccessary sections from the package module pom.xml.
Added Build System Information to pom.xml

Added: The sections ciManagement and distributionManagement are now filled with values for the QuarterBukkit build system.
Bumped Version to 1.5.1-BETA