close #182 create log directory if not exist
adding first task delay issue fixed. close #195
Merge remote-tracking branch 'origin/xjy-parser' into tys-ui-v0.4
close #192
implemeted HELP command
setting the title of the listview during HELP
mismatched exception replaced by InvalidCommandException
Merge branch 'master' into xjy-parser

Conflicts:
	src/Parser/Parser.java
	src/application/InputCommands.java
resolved merge conflicts