v1.2

Included features:
Common:

1. Navigation between the different modes.

Schedule:

1. View for schedule (view [YYYY-MM-DD]).

Event:

1. meeting
2. consultation
3. study
4. lesson

Addressbook:

1. Refactored AB3’s syntax into NOVA’s syntax style (n/ become n, p/ become p, etc)

2. Refactored Address book’s find [KEYWORD] to find n[NAME]
3. Removed AB3’s address
4. Refactored AB3’s tag into category, and made category a compulsory field
5. Implemented category such that it only accepts “classmate” or “teammate”
6. Implemented list c\classmate and list c\teammate, and only display category specific remark