add logistics and accessing db code
add Service struct
add cron
add UpdateAndGetChangedLogistics
fix the GetUnfinishedLogistic issue
change the command; refactor the code; add logistic service to piassistant
add sublogi unsublogi feature
finish logistics query feature
refactor command parsing code
update config file
merge from v0.7
Merge branch 'master' of https://github.com/NoahShen/MyPiAssistant