version25

version 25:
1. hard reset will re-start Bluetooth
2. reminder of connecting sensor after finishing Morning survey
3. previous question works well now
4. a test on inserting a row when survey is skipped or blocked. This is
just half-finished.
5. add more text on 'cancel button' when someone hit it but just want to
go previous question
6. slept -> slept/napped
7. add one more question to CravingStudy app.

8. download app from build-in Chrome is ok now
9. you can set the same password as previous if assigning the same ID
again
10. study day - (need to be discussed before merged and released)
11. add option for removing files on the phone