Delete associated taskruns when deleting tasks
Test project dependant resources are deleted when deleting project
Merge pull request #961 from PyBossa/issue-delete-tasks

Issue delete tasks
Add limit and offset to task repository filter_by methods
Add limit and offset to all repositories filter_by and order result
Use limit and offset in repository method calls in API
Delete file commited by mistake
Merge pull request #962 from PyBossa/issue-api-offset-limit

Issue api offset limit
Fix test names
Merge pull request #963 from PyBossa/issue-fix-test-names

Fix test names
Merge branch 'master' into issue-956-job-importers

* master:
  Fix test names
  Delete file commited by mistake
  Use limit and offset in repository method calls in API
  Add limit and offset to all repositories filter_by and order result
  Add limit and offset to task repository filter_by methods
  Test project dependant resources are deleted when deleting project
  Delete associated taskruns when deleting tasks
Refactor: raise exception from within importer
Refactor: remove useless flags
Refactor, extract class to create tasks