google / benchmark / 1737

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Pull #657

travis-ci

Counter(): add 'one thousand' param.

Needed for https://github.com/google/benchmark/pull/654

Custom user counters are quite custom. It is not guaranteed
that the user *always* expects for these to have 1k == 1000.
If the counter represents bytes/memory/etc, 1k should be 1024.

Some bikeshedding points:
1. Is this sufficient, or do we really want to go full on
   into custom types with names?
   I think just the '1000' is sufficient for now.
2. Should there be a helper benchmark::Counter::Counter{1000,1024}()
   static 'constructor' functions, since these two, by far,
   will be the most used?
3. In the future, we should be somehow encoding this info into JSON.

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