Add interruptBegin and interruptEnd methods

[silverwind]

This allows one to employ custom logging facilities during an interrupt, like for example when one wants to log both to a file and to lines above the bar.

[raijinsetsu]

I was just looking for this feature. Any idea on when this change will be accepted and published?

[ffflabs]

I'd love to see this one merged, so I could use progress alongside Winston or debug