display required skill when listing items in shops
update score
sort skills alphabetically
train monsters only with their own devs
more score work
sell items for experience, spirits can give their experience to monsters
inform players when they advance a level, add required level when failing to possess a monster
purchase from shops with experience
Bumping version to 0.0.24.
Adding line to CHANGELOG: * monsters train with development points, spirits can give exp to monsters / buy and sell items for exp
Merge branch 'feature/exp-dev-work'