Added data and APIs to the task engine to distinguish between failure and dependency failure.
support to extract annotated properties from task results
Merge branch 'master' into separate-depfail
Fix single imports not working.
Merge branch 'master' into separate-depfail
Added debugging task to debug results of tasks.
Merge branch 'master' into separate-depfail
Check for any dependency failures, instead of all.
Persist task status.
Added extra tests for task engine persistence.
Add Not (not success) task. Add factories for Choice and Sequence tasks.
Merge branch 'separate-depfail'
Renamed and, or to choice, sequence.
Added factories for id, combine, collect and rewrite.
Fail
Merge pull request #2 from metaborg/vv/task-factories

Added negation task. 
Added factories for task combinators.
Add a task to lookup all definitions
Make debug task execute even on failure of dependency
Add factory for Id task with dependencies
Allow duplicate key-value pairs when inserting results.
Add task-create-where(s|ctx)
Fix import.