add in interval tree for storage
changes for interval tree
add/update interval tree
Merge branch 'xy-modify-command' of https://github.com/cs2103aug2014-w13-4j/main into storage-chuyu
Merge branch 'pn-modify-task' of https://github.com/cs2103aug2014-w13-4j/main into storage-chuyu
delete isEvent method
refactor add/update method in task storage
Merge branch 'master' of https://github.com/cs2103aug2014-w13-4j/main into storage-chuyu
Merge branch 'master' of https://github.com/cs2103aug2014-w13-4j/main into storage-chuyu
date before/after search
Merge branch 'master' of github.com:cs2103aug2014-w13-4j/main into search-chuyu

Conflicts:
	src/storage/taskStorage/TaskStorage.java
merge with master
merge with near match
fix add bug
Allow before and after params to be passed to storage in logic
Merge branch 'search-chuyu' of github.com:cs2103aug2014-w13-4j/main