Make stringpiece.h #include <algorithm> for std::min().
Make stringpiece.h #include <algorithm> for std::min().

Fixes #33.

Change-Id: I9d283648c10fe84b96652de56c7d6274117d4dfc
Reviewed-on: https://code-review.googlesource.com/2940
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

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