DateSelectActivity and activity_report_screen
Merge branch 'm8' of https://github.com/CS2340/BankNote.git into m8
Work in progress, only for Nghia to pull right now.
credential store uses local file
switching between accounts, spending cat.report, activity lifespan
improvements
deleted login success
Merge branch 'm8.3' of https://github.com/CS2340/BankNote into m8

Conflicts:
	src/com/example/banknote/model/User.java