Updated logic, parser and storage

LocalMemory:
reading external memory now saves to the local memory arraylist

MyTasksParser:
changed the visibility of extractDate from private to public and made
it static

MyTasksStorage:
completed readExtMem()
Merge branch 'master'

Conflicts:
bin/mytasks/logic/LocalMemory.class
bin/mytasks/parser/MyTasksParser.class
Merge branch 'master' of https://github.com/cs2103aug2014-w09-1j/main

Conflicts:
bin/mytasks/logic/LocalMemory.class
bin/mytasks/parser/MyTasksParser.class
Resolving conflicting files