Bukkit

- Drop old ChronJobber support (migration, keep v1.1 available)

- Add possibility to manually trigger jobs

- Extend create permission for each different Job-Type

- Introduction of commands:

- /cron trigger<cronjob-id|enabled|disabled|-cronjob-id> [cronjob-id|enabled|disabled|-cronjob-id] ...

- Introduction of permissions:

- cron.trigger

- cron.create.interval: Permission to create interval-based cronjobs
- cron.create.clock: Permission to create Daily cronjobs
- cron.create.week: Permission to create Weekly cronjobs
- cron.create.month: Permission to create Monthly cronjobs
- cron.create.year: Permission to create Yearly cronjobs