added some functions for multidate feature
multidate feature works for multidates without keywords e.g from
Merge branch 'master' of https://github.com/cs2103-t10-1j/main into tania
Merge branch 'tania' of https://github.com/cs2103-t10-1j/main into HEAD
can now display multiple day tasks
Merge https://github.com/cs2103-t10-1j/main into HEAD

Conflicts:
	LifeOnLine/bin/parser/DateParser.class
	LifeOnLine/bin/parser/DateParserTest.class
	LifeOnLine/bin/parser/LOLParser.class
	LifeOnLine/bin/parser/LOLParserTest.class
	LifeOnLine/src/parser/LOLParserTest.java
Merge pull request #114 from cs2103-t10-1j/HEAD

Head