[TW-1262] task dep.contains: matches characters in UUID instead of ID

_Renato Alves on 2014-02-19T17:28:28Z says:_

Some users reported unexpected behavior when using dep: and dep.*: filters to filter based on task dependencies.

After some testing it became obvious that when using dep: the search is matched against the underlying UUID and not the ID, hence unexpected results.

How to reproduce:

1. Create some tasks and assign dependencies
2. Use task all dep.contains:1
Some tasks may appear, if not create more tasks and dependencies
3. Repeat step 2 but use dep.contains:f
Some tasks may appear, if not create more tasks and dependencies
4. Use task all dep.contains:j
Always returns an empty list