Fix transacting the wrong task
SLAP the GetTask
SLAP the batch add subtasks
Decouple things in AddTask
Merge branch 'master' of https://github.com/cs2103aug2014-w10-1c/main into fix-subtask-display-bug

Conflicts:
	You-QueryEngine/internal/action/batch_add_subtasks.cpp
Fix conflict in add task
SLAP UpdateTask
Refactor delete
Change the type of attachment to a vector of wstring
Remove unneccessary typedefs in unit test
Remove one more anon namespace
SLAP batch add dependencies
Update boost and install the date time package
Fixes #350
Add the std::move fro @lowjoel
Remove BOOST_DATE_TIME_NO_LIB
Use boost serialization to serialize dates
Fix failing test case
Fix bug causing from removing an extra block from UpdateTask
Add integration test with DataStore