Update the commands usage in the plugin.yml so it is changeable for
non-programmers.

Signed-off-by: Staartvin <mijnleraar@msn.com>
Update Javadocs

Signed-off-by: Staartvin <mijnleraar@msn.com>
Getting ready for a new implementation of Stats plugins.
New Stats plugins are hooked in easier than before and will
automatically get used when hooked.

Signed-off-by: Staartvin <mijnleraar@msn.com>