remove sqlite3 code and add test message
remove unused array and add core data save and fetch functions
1. remove unused code
2. add core data save function and fetch function
fix bug which crush when open apps
Merge remote-tracking branch 'origin/mathapp'

Conflicts:

mathapp.xcodeproj/project.xcworkspace/xcuserdata/Goda.xcuserdatad/UserIn
terfaceState.xcuserstate

merge mathapp branch into master