Ability to disable cron periods

[dule]

The library allows you to add custom values, but it doesn't appear to be able to remove some of the default periods (e.g., if you we didn't want to have a "minute" granularity). So maybe being able to pass in a "periods" array to define what periods to display.

[rfreedman]

I would find this very useful too - not sure why the pull request hasn't merged (it's been 3 years).
I added this to my local copy, but it would be nice to have this in the original repo.

[marc-agas]

+1

[DeanKamali]

+1