Alfred-pyworkflow

See [this thread](http://www.alfredforum.com/topic/4716-some-new-alfred-script-environment-variables-coming-in-alfred-24/) for more information.

[Here](http://www.deanishe.net/alfred-workflow/workflow.html#workflow.workflow.Workflow.alfred_env) is Alfred-Workflow's corresponding documentation.

Fix 15

Implement 14

By passing `None` as the data argument to `Workflow.cache_data()`, you can force the deletion of the corresponding cache file:


from workflow import Workflow
wf = Workflow()
wf.cache_data('test', None)


will delete the cache file for name/key `test`.

This may be useful in forcing your workflow to update its cache data.