check whether storage is null before searching
modify names:
Merge branch 'master' of https://github.com/cs2103aug2014-w13-4j/main into chuyu-storage
minor changes for format and small bugs
resolve merge conflict
minor modifications
Implemented conditional dates in the form of a pair of start date and due date
Merge branch 'pn-modify-conditional-task' of https://github.com/cs2103aug2014-w13-4j/main into chuyu-storage
add in tree set to map task attributes
add in the new string to task
add in search of name, note and tags
Merge branch 'chuyu-storage' of github.com:cs2103aug2014-w13-4j/main into pn-logic
Integrate chuyu's code into logic