Added morning, afternoon, evening, night support for parser

morning = 11am
afternoon = 5pm
evening = 7pm
night = 11pm
bug fixing

bug fixing
Added code for BlockTentative command. Awaiting parser support :D
bugfix

bugfix
Partial changes for TentativeTask to work with GUI
bugfix

bugfix
Merge branch 'master' of https://github.com/cs2103aug2014-t11-1j/main into krystal