Added Events when Tools are being leveled up
Implemented Events:
- Tool-Repair
- Random Modifier
- Loot-Drop

Tweaked default config-options

Updated command-structure
New Commands:
- mt addexp [amount]: adds XP to the Tool (permission: minetinker.addexp / default: op)
- mt help: gives a list of available commands (permission: minetinker.help / default: true)
- mt info: gives a short summary about the plugin (permission: minetinker.info / default: true)
- mt mods: gives a list of available modifiers (permission: minetinker.modifiers / default: true)
- mt name [name]: names the Tool (compatible with color codes! just use '^' instead of '§') (permission: minetinker.name / default: true)

Fixes:
- various Nullpointer-Exceptions (by Juessa [ #9] and palipajo [ #8])

Updated version number from a4 to a5