Fix usage props

[zckrs]

• f5a66d7 Fix repeated prompt when generator called directly
• 36be734 Remove fountainPrompting() call in subgenerator
• 1aa0fef Select options for composeWith
• 24584ac Use run loop "default" to compose

[zckrs]

Test failed until https://github.com/FountainJS/fountain-generator/pull/19/files#diff-54603c134fc36fd43e0c4ae33a93d185R38 merged

[micaelmbagira]

👍

[Swiip]

👍