[DB] Fixed definition of tags, removed definition of parent (because latter not working).
[DB] Extracted getTags into one which returns a vector<string> (not implemented) and an internal method which returns a TagArray.
Merge branch 'master' of https://github.com/cs2103aug2014-w13-3c/main
[DB] changed to UUID.
Set default QT version.
[DB] TaskList.h API change. Removed name.