Update screenstory.yml capabilities structure
Add a capability resolve function
Add unit test command
Externalize config file reading

it now is done in the runner.
Take basic screenshot on phantomjs
Add real test for assert include
Comment phantom special options
Resolve all wd related options at once
Use screenstory.yml wd options
Add a method to parse screenshot options
Runner emit a setup event
Remove promise from runner configure method
Fix Travis build
Merge pull request #7 from themouette/features/separate-config

Separate runner config parsing