Add support for Alfred 2.4's environmental variables
Build workflow zip
Merge branch 'release/v1.7'
Remove diff output
Build workflow zip
Link test/info.plist before testing, so background.py can find it
Improve caching performance

Use `cPickle` instead of `pickle` and use best available protocol
Bump version
Build workflow zip
Add data-saving methods and customisable serialisation
Merge branch 'release/v1.8'
Update list of workflows using Alfred-Workflow
Merge branch 'develop'
Update workflow list
Merge branch 'develop'
Add update script
Move self-update mechanism to workflow.py
Fix imports
Fix target dir
Add auto update support for workflows