$ workshop print creates many boilerplates

[timoxley]

After each $ workshop print, a new boilerplate file is generated:

#   foreach.js
#   foreach1.js
#   foreach2.js
#   foreach3.js
#   foreach4.js
#   foreach5.js
#   foreach6.js
#   foreach7.js
#   foreach8.js

Not ideal.

Proposed solution:

If running with print, find largest matching boilerplateN.js file, use that in problem text. If exists, simply do not create new.