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Prevent timeout value from skirting limit check (#3536)

* fix(lib/runnable.js): Prevent timeout value from skirting limit check
   - Moved the timestring->value translation code to before the limit check.
   - Found that previous "fix" hadn't actually fixed the correct value, as the wrong upper bound value had been used (off by one error). 
   - Further research indicated that some versions of IE had problems with negative timeout values. New code clamps to nonnegative numbers ending at `INT_MAX`.
   - Updated the function documentation.

* feat(lib/utils.js): Add `clamp` function
   - New function clamps a numeric value to a given range.

* test(unit/runnable.spec.js): Updated tests for `#timeout(ms)`
   - Restructured `Runnable#timeout` tests to check both numeric/timestamp input values that:
      - less than lower limit
      - equal to lower limit
      - within limits
      - equal to upper limit
      - greater than upper limit

Closes #1652

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