Allow use of TIMES environment variable to control benchmark count
Allow use of TIMES environment variable to control benchmark count

Before committing code I want the full 20 runs, but for quick checking
in-progress changes, I want to be able to run a smaller number of times,
or even just once.

yrro/command-t,yrro/command-t,mtimkovich/command-t,wincent/command-t,mtimkovich/command-t,wincent/command-t,wincent/command-t