Declare 'subject' protected property.
Implement Behat 'runner' class.
Remove unused property declarations.
Remove unused property declarations.
Remove unused 'use' statement.
Catch any exceptions when executing the Behat shell command.
Implement basic 'bevel:run' command.
Use 'BehatApplication' class to run tests.
Leave console output to Behat.
Instantiate BehatRunner with BehatApplication and config string.
Pass 'features' argument to runner (duh).