Support strings containing "from now"

[j-sv]

Adds support for one of the examples listed here.

[olebedev]

Suggested patch changes expected behavior fro deadlines from
strict (within|in) <point in time> for (within|in)? <point in time> (from now)?. This means that even a simple point in time will be treated as a deadline. I am not sure about the approach and still think that keep the rule as narrow as possible could save us from the unexpected indeterministic behavior of the parser.

I suggest implementing a rule like(simplified regexp):

((within|in)\s<point in time>)|(<point in time>\sfrom\now)

so it will be a narrower OR.

[j-sv]

You're right, I hadn't considered that. I'll update it as you suggest.

[olebedev]

Hey @j-sv, just a friendly ping