start work on experience command
finish experience command
persist monsters
spirits and monsters level up when they have enough exp
when multiple items match a string select the one you want by number, e.g. kill orc 2
can train with monster and spirit's power totals
Bumping version to 0.0.9.
Adding line to CHANGELOG: * level up spirits and monsters when they get enough exp
Merge branch 'feature/level-up'