Alfred-pyworkflow

- Don't throw an exception if update finds no valid releases 132

Add support for Alfred's configuration API 125

Change `appinfo` to also work on non-running apps

Helpers
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- Add new [utility functions for running commands and scripts](http://www.deanishe.net/alfred-workflow/api/index.html#utilities-helpers)
- Move some helpers from `workflow.py` to `util.py`


Workflow
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- Write '.' to debugger on start, so real log messages start on a new line
- Use root logger instead of 'workflow'
- Add [`warn_empty()`](http://www.deanishe.net/alfred-workflow/api/index.html#workflow.Workflow3.warn_empty) helper method to `Workflow3`

Ensures that top-level variables are also sent when a modifier is used

is_running` now returns the correct status immediately 124

Big thanks to orf for identifying the problem and the solution.