Change to major endpoint and new endpoint for major

[Taekwonnie]

Right now we can add major by semester, however I think we should link it to a department also.
Current:
Parameter: term,year,major name
After:
params: term,year, department, major name

New endpoint:
getMajorByDepartment
params: term,year,department

return a list of majors belong to that specific department.

[Taekwonnie]

Done