doc/sessions/integration-commands.run

commands:
# Make it fetch first
- directory: ../examples/integration-commands
  command: fetch hello.bst

# Capture a build output
- directory: ../examples/integration-commands
  output: ../source/sessions/integration-commands-build.html
  command: build hello.bst

# Capture a shell output
- directory: ../examples/integration-commands
  output: ../source/sessions/integration-commands-shell.html
  command: shell hello.bst -- hello pony