remove fitness, and replace to slowdown
replace bonus system
make spec file
add spec for SlaveCalculateService#calculate_regist_level_from_temp
remake fitness
change slave base_strength
implement base_strength
implement turn-end in force
commonize and integrate list of train and action
implement refresh-function, when slave become down
delete non-use, commnet-outed lines
not-move, implement slave-list, and load it
add definition of slaves
rename of Train::SlaveTrade
re-implement #load method
implement buy-slave function
implement refresh, when master buy slave in market
change order of menu
add id to slave
rename xx_action => xx_menu